This article contains a representative list of notable databases and search engines useful in an academic setting for finding and accessing articles in academic journals, institutional repositories, archives, or other collections of scientific and other articles. Databases and search engines differ substantially in terms of coverage and retrieval qualities. [1] Users need to account for qualities and limitations of databases and search engines, especially those searching systematically for records such as in systematic reviews or meta-analyses. [2] As the distinction between a database and a search engine is unclear for these complex document retrieval systems, see:
The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
The "Size" column denotes the number of documents (articles, publications, datasets, preprints) rather than the number of citations or references. The database itself should be the primary source of statistics, and if it is not accessible, the independent estimates released as journal papers should be. Notably, Google Scholar does not offer such detail, but the database's size has been calculated. [2]
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
This list focuses on general-purpose services; OpenDOAR can be used to find thousands open-access repositories. The table is sorted by the number of works for which full-text is made available.
Name | Discipline(s) | Size (full-texts) | Description | Access cost | Open data | Provider(s) |
---|---|---|---|---|---|---|
Internet Archive Scholar | Multidisciplinary | 25,000,000 | Focus on fulltext search of open access journals and conference proceedings | Free | Yes | Internet Archive |
CORE [3] | Multidisciplinary | 9,800,000 [4] (207,000,000 metadata [5] ) | A full text aggregator of all open access papers from repositories (institutional, subject, preprints, etc.) and journals. Around 20 million monthly active users. | Free | No [4] | Open University |
CiteSeerX [6] | Multidisciplinary | 8,401,126 | Replaced CiteSeer, and ChemXSeer. Mainly Computer science, Statistics, Mathematics. | Free | Semi-free [7] | Pennsylvania State University |
Semantic Scholar | Multidisciplinary | 8,100,000 [8] (200,000,000 metadata [9] ) | Mostly computer science and biomedical publications. Powered by semantic analysis. | Free | Semi-free [8] | Allen Institute for Artificial Intelligence |
Europe PMC [10] | Biomedical | 7,500,000 (39,000,000 metadata) | Abstracts & full text ( 7.5 million) biomedical and life sciences articles (Dec 2020). Includes text mining tools and links to external molecular and medical data sets. | Free | Yes | EMBL-EBI |
PubMed Central (PMC) [11] | Biomedical, life sciences | 7,500,000 | Free full-text archive of publications and preprints | Free | Yes | NIH, NLM |
ResearchGate | Multidisciplinary | 4,000,000[ citation needed ] | Commercial social networking site for scientists and researchers. Over 19 million registered users that share their articles, datasets and other research output. | Free | No | ResearchGate GmbH |
SSRN: Social Science Research Network | Social science | 950,733 | Research papers from more than 55 disciplines | Free & Subscription | No | Elsevier |
HAL | Multidisciplinary | 760,000 (2,000,000 metadata) [12] | An open-access database for French researchers. Organized into institution and domain portals. | Free | Yes | CNRS's Centre pour la Communication Scientifique Directe (CCSD) |
RePEc: Research Papers in Economics [13] | Economics | 90,000 (3,200,000 metadata) [14] | Working papers, journal articles, books, books chapters and software components (including 1.2 million full-text articles) | Free | IDEAS: Federal Reserve Bank of St. Louis EconPapers: Örebro University School of Business | |
PhilPapers | Philosophy | 70,000 [15] (2,540,317 metadata) | Index journals, books, open access archives, and personal pages maintained by academics | Free | PhilPapers | |
ERIC: Educational Resource Information Center [16] | Education | Unknown (1,500,000 metadata) | Education literature and resources dating back to 1966. | Free & Subscription | United States Department of Education (available by subscription from OCLC, CSA) |
Name | Discipline(s) | Size | Description | Access cost | Provider(s) |
---|---|---|---|---|---|
Academic Search [17] | Multidisciplinary | Several versions: Complete, Elite, Premier, and Alumni Edition | Subscription | EBSCO Publishing | |
Aerospace & High Technology Database | Aerospace, Aeronautics, Astronautics | Provides indexing and abstracts from current serial and non-serial titles, including content from AIAA and NASA | Subscription | ProQuest | |
African Journals OnLine (AJOL) [18] | Multidisciplinary | 185,649 | Scholarly journals published in Africa | Free & Subscription | AJOL |
AgeLine [17] | Sociology, Gerontology | Includes information on aging-related topics, including economics, public health and policy | Subscription | EBSCO Publishing | |
AGRICOLA: Agricultural Online Access [19] | Agriculture | Provides public access to information on agriculture and allied fields (17th century - present) | Free & Subscription | NAL (free access NAL, subscription access ProQuest, OVID) | |
AGRIS: Agricultural database [20] | Agriculture | 12,021,578 | Covers agriculture, forestry, animal husbandry, aquatic sciences and fisheries, human nutrition, extension literature from over 100 countries. Indexes unpublished scientific and technical reports, theses, conference papers, government publications. | Free | FAO |
Airiti | Multidisciplinary | Chinese e-content provider of Chinese academic e-journals, Taiwanese academic e-journals, classical art images | Subscription | Airiti Inc. | |
Analytical Abstracts [21] | Chemistry | 505,481 | Selection of analytical chemistry articles published by the Royal Society of Chemistry (around 100 journals) | Subscription | RSC |
Anthropological Index Online [22] | Anthropology | Indexes only (no abstracts or full-text) the anthropology journals received by The Anthropology Library at The British Museum | Free & Subscription | RAI | |
Anthropological Literature [23] | Anthropology, Archaeology | 670,000 | An index of journals primarily from Tozzer Library, as well as other open-access journals (660 journals with more than 670,000 articles) | Free & Subscription | Harvard University (non-Harvard access provided by OCLC) |
Arachne [24] | Archaeology, Art history | 4,485,534 | 2.4 million digital images from archive material, 1 million of books, 40,000 high quality scans of ancient sculptures, 300 volumes of ancient books with more than 60,000 pages | Free | DAI & University of Cologne |
ArchiveGrid | Multidisciplinary | Directory of archival materials from American and international institutions, including over five million records | Free | WorldCat | |
AMiner [25] | Computer Science | 265,034,285 | Online service used to index and search academic social networks | Free | Tsinghua University |
Arts & Humanities Citation Index [26] | Arts, Humanities | 4,900,000 | Part of Web of Science. 1,800 journals across 28 arts & humanities disciplines. Records back from 1975 to present. | Subscription | Clarivate Analytics |
ASCE Library | Civil Engineering | 150,000 | All civil engineering disciplines including structural engineering, geotechnical engineering, transportation engineering, construction engineering, environmental engineering, engineering mechanics, sustainability, water resources, irrigation. hydraulics, hydrology, waterways, urban planning, cold regions ... | Free & Subscription | ASCE |
Astrophysics Data System [27] | Astrophysics, Geophysics, Physics | 13,300,000 | Publications in Astronomy and Astrophysics, Physics, and the arXiv e-prints | Free | Harvard University |
ATLA Religion Database [28] | Religious studies | 3,000,000 | Provides information on topics such as biblical studies, world religions, church history, and religion in social issues | Subscription | EBSCO Publishing |
AULIMP: Air University Library's Index to Military Periodicals | Military Science | The articles, news items, book reviews and editorials from 63 English language military and aeronautical periodicals | Free | Air University | |
BASE: Bielefeld Academic Search Engine [29] | Multidisciplinary | 259,497,239 | Metadata for 260 million documents from more than 8,000 content providers | Free | Bielefeld University |
Biological Abstracts [30] | Biology | Biomedical research literature published from more than 4,000 journals internationally. | Subscription | Thomson Reuters | |
Book Review Index Online | Book reviews | 5,600,000 | Reviews of periodicals and books – including those on tape and electronic media | Subscription | Thomson Gale |
Books in Print | Books | 2,500,000 | Reviews covering over 2.5 million titles | Subscription | R. R. Bowker |
CAB Abstracts | Applied life sciences | 10,000,000 | Bibliographic information service providing access to applied life sciences literature. | Subscription | CABI |
Cabells | Multidisciplinary | 35,000 | Database to discover, evaluate, and compare journals. Journal listings include publication info, submission guidelines, and metrics. | Subscription | Cabells |
Chemical Abstracts Service | Chemistry | Approximately 8,000 journals, technical reports, dissertations, conference proceedings, and new books | Subscription | ACS | |
Chinese Social Sciences Citation Index [31] | Social sciences | 60,000 | Covers about 500 Chinese academic journals of humanities and social sciences | Subscription | Nanjing University |
CINAHL: Cumulative Index to Nursing and Allied Health [32] | Nursing, Allied Health | 7,800,000 | Journal articles about nursing, allied health, biomedicine and healthcare. Covers 5,500 journals (English and other language). | Subscription | EBSCO |
CiNii [33] | Multidisciplinary | 22,000,000 | Database of articles in the Japanese language from 3600 journals | Free & Subscription | National Institute of Informatics |
CHBD: Circumpolar Health Bibliographic Database [34] | Medicine | 7,900 | Contains records describing publications about all aspects of human health in the circumpolar region | Free | University of Calgary |
Civil engineering database | Civil engineering | 270,000 | A bibliographic database covering all of ASCE's publications since 1872 | Free | American Society of Civil Engineers |
CNKI | Multidisciplinary | 160,000,000 | A Chinese bibliographic database | Free & Subscription | CNKI |
Cochrane Library | Medicine, Healthcare | Includes reviews of research to promote evidence-based healthcare. | Subscription | Wiley Interscience | |
CORE [35] | Multidisciplinary | 207,000,000 [36] | Around 20 million monthly active users. | Free | Open University |
Crossref [37] | Multidisciplinary | 111,231,936 | An official Digital Object Identifier (DOI) Registration Agency of the International DOI Foundation. Metadata about publications, datasets, grants, preprints from 17,633 members (journals, publishers, etc.) | Free | Crossref |
Current Contents | Multidisciplinary | Part of Web of Science. Contains 7 discipline-specific subsets. | Subscription | Clarivate Analytics | |
DeepDyve | Multidisciplinary | 20,000,000 | Commercial website that sells access to scientific and scholarly articles from a large range of academic publishers (over 1700 journals). Limited free access. | Free & Subscription | DeepDyve |
Dimensions [38] | Multidisciplinary | 302,000,000 | Publications, books and book chapters, preprints and conference proceedings (linked to data sets, funding, publications, patents, clinical trials, and policy documents). Based on CrossRef. Contains citation-based indicators and Altmetric attention scores. | Free & Subscription | Digital Science & Research Solutions Ltd |
Directory of Open Access Journals (DOAJ) [39] | Multidisciplinary | 8,265,735 | Articles from 18,652 open access journals (Dec 2022) | Free | Infrastructure Services for Open Access (IS4OA) |
DBLP [40] | Computer science | 5,387,041 | Comprehensive list of papers from major computer science conferences and journals | Free | Leibniz Center for Informatics and University of Trier |
EconBiz [41] | Economics | 10,000,000 | Covers journals, working papers & conferences in business studies and economics | Free | ZBW- German National Library of Economics– Leibniz Information Centre for Economics (ZBW) |
EconLit [42] | Economics | 1,600,000 | Covers articles and other materials dating back to 1969 | Subscription | American Economic Association (available from EBSCOhost, ProQuest, OVID, and AEA) |
Ei Compendex | Engineering | 20,000,000 | Electronic version of Engineering Index | Subscription | Elsevier |
EMBASE [43] | Biomedicine, Pharmacology | 32,000,000 | Biomedical database with a focus on drug and pharmaceutical research. Rrecords from over 8,500 journals (1947–present). | Subscription | Elsevier |
FSTA – Food Science and Technology Abstracts | Food science, Food technology, Nutrition | 1,500,000 | The database of information on food science, food technology and nutrition | Subscription | IFIS Publishing (available via EBSCOhost, IHS Inc., Ovid, Proquest Dialog, STN and Web of Science) |
GeoRef [44] | Geosciences | 4,000,000 | Records from 3,500 journals in 40 languages | Subscription | American Geosciences Institute |
Global Health [45] | Public Health | 3,100,000 | Specialist abstracting and indexing database dedicated to public health research and practice. Contains scientific records from 1973 to the present. | Subscription | CABI |
Google Scholar [1] | Multidisciplinary | 389,000,000 | The biggest academic database & search engine (over 390 million records, unofficial estimate) | Free | |
Index Copernicus [46] | Multidisciplinary | Contains over 2,500 journals (including 700 journals from Poland). | Free | Index Copernicus Ltd | |
Information Bridge: Department of Energy Scientific and Technical Information | Multidisciplinary | 266,000 | Provides free public access to over 266,000 full-text documents and bibliographic citations of Department of Energy (DOE) research report literature. Documents are primarily from 1991 forward. | Free | DOE (OSTI) |
Informit | Multidisciplinary | 8,000,000 | Australasian aggregator of bibliographic databases and journals | Subscription | RMIT Training Pty Ltd (RMIT Training) |
Indian Citation Index [47] | Multidisciplinary | 860,000 | Covers articles from 1100+ journals from India from scientific, technical, medical, and social sciences | Subscription | ICI |
IARP [48] | Multidisciplinary | Open-access knowledge management system incorporating grants, publications, conferences in natural and social & behavioral sciences | Free | Volunteer Collaboration | |
Inspec | Physics, Engineering, Computer Science | 18,000,000 | Contains records in physics, electrical engineering, electronics, communications, control engineering, information technology, manufacturing, production, and mechanical engineering. | Subscription | IET |
INSPIRE-HEP | Physics, (High Energy) | An open access digital library for the field of high energy physics (HEP) (operates since the 1970s) | Free | CERN, DESY, Fermilab, SLAC and IHEP | |
International Directory of Philosophy | Philosophy | 37,000 | Contains information on university philosophy departments and programs, philosophical societies, research centers, journals, and philosophy publishers in the U.S., Canada, and approximately 130 other countries. | Free & Subscription | Philosophy Documentation Center |
International Medieval Bibliography [49] | Medieval studies | 440,000 | A multidisciplinary bibliographic database covering Europe, North Africa and the Middle East for the entire period from AD 300 to 1500 | Subscription | Leeds University (available from Brepols Publishers) |
International Nuclear Information System (INIS) [50] | Nuclear Physics, Nuclear Energy, Medical Physics | 4,600,000 | A leading bibliographic and grey literature repository covering all areas of nuclear science and technology. | Free | International Atomic Energy Agency |
International Philosophical Bibliography | Philosophy | 1,000,000 | Focus on the history of philosophy and continental philosophy. | Subscription | Université Catholique de Louvain (available from Peeters Publishers) |
J-Gate [51] | Multidisciplinary | 71,692,382 | J-Gate is an electronic gateway to global e-journal literature (articles from 58,000 journals) | Free & Subscription | Informatics India Ltd |
JournalSeek | Multidisciplinary | Catalogues over 39,000 journals' information (the description, aims, scope, journal abbreviation, journal homepage link, subject category and ISSN). | Free & Subscription | Genamics | |
Jurn | Multidisciplinary | Index property and open access journals in the arts, humanities, ecology, science, biomedical, business and economics. | Free | David Haden | |
L'Année philologique | Classical studies | Over 860,000 bibliographical entries, including keywords, abstracts, and links to the full text. | Subscription | Société Internationale de Bibliographie Classique (available from Brepols Publishers) | |
LexisNexis | Law | Electronic database for legal and public-records related information | Subscription | Reed Elsevier | |
The Lens [52] | Multidisciplinary | 228,108,724 | Serves global patent and scholarly knowledge as a public good to inform science and technology enabled problem solving. | Free & Subscription | Cambia |
Lingbuzz | Linguistics | 550,000 | A free archive of linguistics articles, with a focus on syntax, semantics, phonology and morphology | Free | University of Tromsø |
Linguamatics | Medicine, Healthcare, Patents | Interface for searching MEDLINE, ClinicalTrials.gov, FDA Drug Labels, PubMed Central, and Patent Abstracts. | Subscription | Linguamatics | |
Logeion | Classical Studies | An open-access database of Latin and Ancient Greek dictionaries | Free | University of Chicago | |
MathSciNet | Mathematics | 3,600,000 | Records from 650 math journals (early 1800–present) | Subscription | American Mathematical Society |
MEDLINE | Medicine, Healthcare | 26,000,000 | Easy-to-use interface to search and retrieve citations and abstracts from 5,200 journals via MeSH vocabulary | Free | NLM |
Mendeley [53] | Multidisciplinary | 100,000,000 | Crowdsourced database of research documents. Over 100M documents uploaded by the researchers plus data from repositories (e.g. PubMed and arXiv) | Free & Subscription | Elsevier |
MyScienceWork | Multidisciplinary | 90,000,000 | Database includes more than 90 million scientific publications and 12 million patents. | Free | MyScienceWork Inc |
National Criminal Justice Reference Service | Criminology, Sociology | 225,000 | Abstracts of scholarly journal articles, agency and NGO reports, audiovisual products, and conference proceedings. | Free | United States Department of Justice, Office of Justice Programs |
National Diet Library Collection | Multidisciplinary | 44,187,016 | Japanese. Catalog for the National Library of Japan. | Free | National Diet Library |
OAIster [54] | Multidisciplinary | 30,000,000 | Covers records contributed by over 1,500 organizations | Free | OCLC |
OpenAlex | Multidisciplinary | 205,000,000 [55] | Index and metadata for all scholarly output. | Free | Our Research |
OpenGray | Grey literature | 700,000 | Indexes European grey literature | Free | Institut de l'information scientifique et technique |
ORCID [56] | Multidisciplinary | An open and independent registry for contributor identification in research and academic publishing. List: biography, education, employment, works, grants, peer-review. Over 9.3 million profiles. | Free | ORCID Inc. | |
Paperity [57] | Multidisciplinary | 7,238,477 | Aggregator of open access journals and papers (>15,000 journals) | Free | Paperity Sp. z o.o. |
Philosophy Documentation Center eCollection | Applied ethics, Philosophy, Religious studies | Journals, series, conference proceedings, and other works from several countries online | Free & Subscription | Philosophy Documentation Center | |
Philosophy Research Index | Philosophy | 1,340,000 | Index of books, journals, disserations, and other documents | Subscription | Philosophy Documentation Center |
POIESIS: Philosophy Online Serials | Philosophy, applied ethics, religious studies | Journals and series, online access for institutions with print | Free & Subscription | Philosophy Documentation Center | |
PsycINFO | Psychology | 3,700,000 | Focus at behavioral science and mental health. Coverage 1887–present. | Subscription | APA |
Publons [58] | Multidisciplinary | Service for academics to track their peer review and editorial contributions for academic journals. Merged with ResearcherID | Free | Clarivate Analytics | |
PubMed [59] | Biomedical, life sciences | 30,000,000 | A database primarily of references and abstracts on life sciences and biomedical topics. Includes MEDLINE, PubMed Central, and Bookshelf. | Free | NIH, NLM |
PubPsych | Psychology | 800,000 | Datasets and offers, where available, full-text linking, links to additional information and link resolving | Free | Leibniz Institute for Psychology Information |
Readers' Guide to Periodical Literature | Literature | Reference guide to articles in >470 periodical magazines and journals, organized by article subject (1890 to present) | Subscription | H. W. Wilson Company | |
Rock's Backpages [60] | Music | 40,000 | Primary documents from the history of rock and roll. Articles, including interviews, features and reviews, which covered popular music from blues and soul | Free & Subscription | Backpages Ltd |
Russian Science Citation Index | Multidisciplinary | 35,409,829 | A bibliographic database of scientific publications in Russian | Free | Scientific Electronic Library |
SafetyLit | Multidisciplinary | 640,000 | >35 distinct professional disciplines (architecture - zoology) relevant to preventing unintentional injuries, violence, and self-harm | Free | SafetyLit Foundation |
Science.gov | Multidisciplinary | A gateway to government science information and research results from over 60 databases, over 2,200 websites, and over 200 million pages. | Free | United States Government | |
Science Citation Index [61] | Multidisciplinary | Part of Web of Science. 24,000+ journals across 254 subject disciplines. | Subscription | Clarivate Analytics | |
ScienceOpen | Multidisciplinary | 66,000,000 | Natural and physical sciences, social sciences, and humanities. Incorporates arXiv, PubMed, and SciELO. Integrated with ORCID Altmetric uids. Articles from >25,000 journals. | Free | ScienceOpen Inc. |
Scientific Information Database (SID) | Engineering & Technology, Medical Science, Basic Science, Human Sciences | An Iranian index of academic journals and access to full text or metadata | Free | Scientific Information Database | |
Scilit | Multidisciplinary | 146,162,525 | A comprehensive, free database for scientists using a new method to collate data and indexing scientific material. The crawlers extract the latest data from CrossRef and PubMed on a daily basis. | Free | MDPI |
SCIndeks - Serbian Citation Index | Multidisciplinary | 80,000 | A bibliographic database, a national citation index, an Open Access full-text journal repository and an electronic publishing platform. Articles from >230 journals. | Free | CEON/CEES - Centre for Evaluation in Education and Science |
Scopus [62] | Multidisciplinary | 78,000,000 | Records from over 20,500 titles from over 5,000 international publishers | Subscription | Elsevier |
SNAC (Social Networks and Archival Contexts) | Multidisciplinary | Directory of archival materials grouped by subject entity | Free | ||
Social Sciences Citation Index | Social science | Part of Web of Science | Subscription | Clarivate Analytics | |
Socolar | Multidisciplinary | Scholarly open access resources in different language (mainly Chinese) | Free & Subscription | China Educational Publications Import and Export Corporation | |
Sparrho | Multidisciplinary | 60,000,000 | Research articles and patents from 45k+ journals and preprint servers. Uses content recommendation concept. | Subscription | Distylled Ltd. |
Ulrich's Periodicals Directory | Multidisciplinary | 336,000 | Provides serials for periodicals | Subscription | ProQuest |
VET-Bib | Social Science, Education | 80,000 | European vocational education and training (VET) literature | Free | Cedefop |
Web of Science [62] | Multidisciplinary | 171,000,000 | Includes other products, such as Social Sciences Citation Index, Science Citation Index, Biological Abstracts & The Zoological Record | Subscription | Clarivate Analytics |
WestLaw | Law | Over 40,000 databases of case law, state and federal statutes, administrative codes, newspaper and magazine articles, public records, law journals, law reviews, treatises, legal forms and other information resources | Subscription | Thomson Reuters | |
WorldCat [63] | Multidisciplinary | Unified catalog of member libraries' catalogs | Free & Subscription | OCLC Inc. | |
WorldWideScience | Multidisciplinary | A union catalog that itemizes the collections of 17,900 libraries in 123 countries | Free & Subscription | DOE (OSTI) | |
Zasshi Kiji Sakuin: Japanese Periodicals Index | Multidisciplinary | 6,600,000 | Scholarly articles in Japanese | Free & Subscription | National Diet Library |
Zentralblatt MATH | Mathematics | 4,000,000 | Mainly reviews and abstracts. | Free | FIZ Karlsruhe |
The Zoological Record | Zoology | 3,500,000 | Unofficial register of scientific names & papers in zoology. Coverage 1864–present. | Subscription | Clarivate Analytics |
Content by most academic publishers is indexed by CrossRef, DOAJ and/or DataCite. Some publishers are also listed separately in the table below.
Name | Discipline(s) | Size | Description | Access cost | Provider(s) |
---|---|---|---|---|---|
Association for Computing Machinery Digital Library | Computer Science, Engineering | 2,892,573 | Collection of all ACM publications, including journals, conference proceedings, technical magazines, newsletters and books | Subscription | Association for Computing Machinery |
Analytical Sciences Digital Library [64] | Analytical chemistry | A collection of peer-reviewed electronic resources on chemical measurements and instrumentation | Free | NSDL and ACS | |
Bibliographie de civilisation médiévale | Medieval studies | A bibliography of monographs on the Middle Ages. As of 2018, it contains about 65,000 fully classified bibliographic records. | Subscription | University of Poitiers (available from Brepols Publishers) | |
BioOne | Biology, Ecology, Environmental Science | Full-text from >180 scientific journals in Biodiversity Conservation, Biology, Ecology, Environmental Science, Entomology, Ornithology, Plant Science, and Zoology. | Free & Subscription | BioOne | |
IEEE Xplore | Computer Science, Engineering, Electronics | 5,360,654 | Over 5 million records. | Subscription | IEEE |
IngentaConnect | Multidisciplinary | 5,000,000 | Covers articles from 13,000 journals | Free & Subscription | Ingenta |
JSTOR: Journal Storage | Multidisciplinary | 12,000,000 | Journal articles, books, and primary sources in 75 disciplines (1870–present) | Free & Subscription | JSTOR |
OpenEdition.org | Humanities, social science | 60,000 | Offers four international-scale publication and information platforms in the humanities and social sciences (10,661 books, 549 journals, 3793 blogs, 45,591 events). | Free | Cléo (UMS 3287) CNRS EHESS University of Avignon |
Project MUSE | Humanities, social science | MUSE's online journal collections are available on a subscription basis to academic, public, special, and school libraries. More than 2,500 libraries worldwide subscribe. | Subscription | Project MUSE, Johns Hopkins University Press | |
SciELO | Multidisciplinary | 573,525 | Database and a model for cooperative electronic publishing in developing countries (mostly South America and Africa). Indexes >1700 journals. | Free | FAPESP, CNPq and BIREME |
ScienceDirect | Science including Medicine | 18,000,000 | Content from more than 4,000 academic journals and 30,000 e-books | Subscription | Elsevier |
SpringerLink | Multidisciplinary | 13,859,779 | Journals, books, series, protocols, reference works and proceedings | Free & Subscription | Springer |
The following services are no longer operating; this may be because they were not updated, abandoned entirely, replaced by other, etc.
Name | Discipline(s) | Description | Access cost | Provider(s) |
---|---|---|---|---|
Bioinformatic Harvester | Biology, Bioinformatics | A meta search engine for 50 major bioinformatic databases and projects. Project appears to be not available anymore. | Free | Liebel-Lab KIT from Karlsruhe Institute of Technology |
citeULike | Computer science | Not available. Ceased operations as of March 30, 2019 | Free | Oversity Ltd. |
ChemXSeer | Chemistry | The project seems abandoned in 2018 | Free | Pennsylvania State University |
citebase Search | Mathematics, Computer science, Physics | Semi-autonomous citation index of free online research. Not available; ceased operations in 2013 | Free | University of Southampton |
citeSeer | Computer Science | Replaced by citeSeerX. | Free | Pennsylvania State University |
Chemisches Zentralblatt Structural Database | Science, Chemistry | Web-based retrieval application that provided language-independent access to the information contained in Chemisches Zentralblatt | Subscription | InfoChem |
CogPrints: Cognitive Sciences Eprint Archive | Multidisciplinary | An electronic archive for self-archive papers in Psychology, Neuroscience, Linguistics, Computer Science, Philosophy, Biology, and Medicine. Contains over 2000 free articles. Not updated since 2017. | Free | University of Southampton |
The Collection of Computer Science Bibliographies | Computer science | One of the oldest (if not the oldest) bibliography collections freely accessible on the Internet (founded 1993). Contains 4.2 million records. Not updated since 2017. | Free | Alf-Christian Achilles |
Current Index to Statistics | Statistics | Limited free search. Not updated since 2017. | Subscription | American Statistical Association and the Institute of Mathematical Statistics |
GENESIS | Women's history | Descriptions of women's history collections from sources in the UK, as well as women's history websites. | Free | London Metropolitan University |
HCI Bibliography | Human–computer interface | An electronic bibliography for most of HCI for researchers, developers, educators, and students. Over 126,000 publications. Not updated since 2018. | Free | Gary Perlman |
International Bibliography of Humanism and the Renaissance | Renaissance studies | A bibliography of academic publications on European culture and history in the 16th and 17th centuries. It seems that the database is not available and not updated since 2013. | Subscription | Brepols Publishers |
Meteorological and Geoastrophysical Abstracts | Meteorology, Astrophysics, Geology | Over 508,379 records from 654 journals. It seems that the database is not available and not updated since 2009. | Subscription | American Meteorological Society (available from Dialog and CSA). |
Microsoft Academic [65] | Multidisciplinary | Covered publications from over 49,000 journals. Retired on December 31, 2021. [66] | Free | Microsoft |
POPLINE | Population, Family Planning | A collection of population, family planning and related reproductive health and development literature. Retired in 2019. | Free | Knowledge for Health, Center for Communication Programs, JHSPH |
Questia: Online Research Library | Multidisciplinary | Emphasis on books and journal articles in the humanities and social sciences. Closed down on December 21, 2020 | Subscription | Questia |
Science Accelerator | Multidisciplinary | A gateway to results of DOE research and development and major R&D accomplishments of interest to DOE. Not working from 2014 | Free | DOE |
CiteSeerX is a public search engine and digital library for scientific and academic papers, primarily in the fields of computer and information science.
An academic journal or scholarly journal is a periodical publication in which scholarship relating to a particular academic discipline is published. Academic journals serve as permanent and transparent forums for the presentation, scrutiny, and discussion of research. They nearly-universally require peer-review or other scrutiny from contemporaries competent and established in their respective fields. Content typically takes the form of articles presenting original research, review articles, or book reviews. The purpose of an academic journal, according to Henry Oldenburg, is to give researchers a venue to "impart their knowledge to one another, and contribute what they can to the Grand design of improving natural knowledge, and perfecting all Philosophical Arts, and Sciences."
Open access (OA) is a set of principles and a range of practices through which research outputs are distributed online, free of access charges or other barriers. With open access strictly defined, or libre open access, barriers to copying or reuse are also reduced or removed by applying an open license for copyright.
A citation index is a kind of bibliographic index, an index of citations between publications, allowing the user to easily establish which later documents cite which earlier documents. A form of citation index is first found in 12th-century Hebrew religious literature. Legal citation indexes are found in the 18th century and were made popular by citators such as Shepard's Citations (1873). In 1961, Eugene Garfield's Institute for Scientific Information (ISI) introduced the first citation index for papers published in academic journals, first the Science Citation Index (SCI), and later the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI). American Chemical Society converted its printed Chemical Abstract Service into internet-accessible SciFinder in 2008. The first automated citation indexing was done by CiteSeer in 1997 and was patented. Other sources for such data include Google Scholar, Microsoft Academic, Elsevier's Scopus, and the National Institutes of Health's iCite.
Bibliometrics is the use of statistical methods to analyse books, articles and other publications, especially in regard with scientific contents. Bibliometric methods are frequently used in the field of library and information science. Bibliometrics is closely associated with scientometrics, that is the analysis of scientific metrics and indicators, to the point that both fields largely overlap.
Scientometrics is the field of study which concerns itself with measuring and analysing scholarly literature. Scientometrics is a sub-field of informetrics. Major research issues include the measurement of the impact of research papers and academic journals, the understanding of scientific citations, and the use of such measurements in policy and management contexts. In practice there is a significant overlap between scientometrics and other scientific fields such as information systems, information science, science of science policy, sociology of science, and metascience. Critics have argued that over-reliance on scientometrics has created a system of perverse incentives, producing a publish or perish environment that leads to low-quality research.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other scholarly literature, including court opinions and patents.
ScienceDirect is a website which provides access to a large bibliographic database of scientific and medical publications of the Dutch publisher Elsevier. It hosts over 18 million pieces of content from more than 4,000 academic journals and 30,000 e-books of this publisher. The access to the full-text requires subscription, while the bibliographic metadata is free to read. ScienceDirect is operated by Elsevier. It was launched in March 1997.
Citation impact is a measure of how many times an academic journal article or book or author is cited by other articles, books or authors. Citation counts are interpreted as measures of the impact or influence of academic work and have given rise to the field of bibliometrics or scientometrics, specializing in the study of patterns of academic impact through citation analysis. The journal impact factor, the two-year average ratio of citations to articles published, is a measure of the importance of journals. It is used by academic institutions in decisions about academic tenure, promotion and hiring, and hence also used by authors in deciding which journal to publish in. Citation-like measures are also used in other fields that do ranking, such as Google's PageRank algorithm, software metrics, college and university rankings, and business performance indicators.
The h-index is an author-level metric that measures both the productivity and citation impact of the publications, initially used for an individual scientist or scholar. The h-index correlates with obvious success indicators such as winning the Nobel Prize, being accepted for research fellowships and holding positions at top universities. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications. The index has more recently been applied to the productivity and impact of a scholarly journal as well as a group of scientists, such as a department or university or country. The index was suggested in 2005 by Jorge E. Hirsch, a physicist at UC San Diego, as a tool for determining theoretical physicists' relative quality and is sometimes called the Hirsch index or Hirsch number.
The Science Citation Index Expanded – previously entitled Science Citation Index – is a citation index originally produced by the Institute for Scientific Information (ISI) and created by Eugene Garfield. It was officially launched in 1964 and is now owned by Clarivate. The indexing database covers more than 9,200 notable and significant journals, across 178 disciplines, from 1900 to the present. These are alternatively described as the world's leading journals of science and technology, because of a rigorous selection process.
The Social Sciences Citation Index (SSCI) is a commercial citation index product of Clarivate Analytics. It was originally developed by the Institute for Scientific Information from the Science Citation Index. The Social Sciences Citation Index is a multidisciplinary index which indexes over 3,400 journals across 58 social science disciplines – 1985 to present, and it has 122 million cited references - 1900 to present. It also includes a range of 3,500 selected items from some of the world's finest scientific and technical journals. It has a range of useful search functions such as ‘cited reference searching’, searching by author, subject, or title. Whilst the Social Sciences Citation Index provides extensive support in bibliographic analytics and research, a number of academic scholars have expressed criticisms relating to ideological bias and its English-dominant publishing nature.
Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it. They have been introduced as official research evaluation tools in several countries.
Metadata is "data that provides information about other data", but not the content of the data, such as the text of a message or the image itself. There are many distinct types of metadata, including:
ResearcherID is an identifying system for scientific authors. The system was introduced in January 2008 by Thomson Reuters Corporation.
The Google Ngram Viewer or Google Books Ngram Viewer is an online search engine that charts the frequencies of any set of search strings using a yearly count of n-grams found in printed sources published between 1500 and 2019 in Google's text corpora in English, Chinese (simplified), French, German, Hebrew, Italian, Russian, or Spanish. There are also some specialized English corpora, such as American English, British English, and English Fiction.
Author-level metrics are citation metrics that measure the bibliometric impact of individual authors, researchers, academics, and scholars. Many metrics have been developed that take into account varying numbers of factors.
Semantic Scholar is an artificial intelligence–powered research tool for scientific literature developed at the Allen Institute for AI and publicly released in November 2015. It uses advances in natural language processing to provide summaries for scholarly papers. The Semantic Scholar team is actively researching the use of artificial-intelligence in natural language processing, machine learning, Human-Computer interaction, and information retrieval.
Microsoft Academic was a free internet-based academic search engines for academic publications and literature, developed by Microsoft Research, shut down in 2022. At the same time, OpenAlex launched and claimed to be a successor to Microsoft Academic.
E-Theses Online Service (EThOS) is a bibliographic database and union catalogue of electronic theses provided by the British Library, the National Library of the United Kingdom. As of February 2022 EThOS provides access to over 500,000 doctoral theses awarded by over 140 UK higher education institutions, with around 3000 new thesis records added every month.