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↑ John Eidson (2000). "Which Past for Whom? Local Memory in a German Community during the Era of Nation Building". Ethos. 28 (4): 575–607. doi:10.1525/eth.2000.28.4.575. JSTOR640617.
↑ "Foreign Camera Clubs: German". American Annual of Photography and Photographic Times Almanac for 1904. New York: Scovill & Adams Company. hdl:2027/mdp.39015067127715.
B. Hundeshagen (1832), Die Stadt und Universität Bonn am Rhein[City and University of Bonn on the Rhine] (in German), Bonn: Tobias Habicht, OCLC165879286, OL23434076M
"Bonn". Kleiner Führer für die Rhein-Reise von Köln bis Frankfurt[Short guide for a trip along the Rhine from Cologne to Frankfurt]. Griebens Reisebücher (in German). Vol.75. Berlin: Albert Goldschmidt. 1900 – via Google Books.
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