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References
- ↑ International Association of Engineering Geology International Congress (1990). Proceedings. ISBN 90-6191-664-X.[ author missing ][ title missing ][ page needed ][ verification needed ]
- ↑ Seargent, David (2009). The Greatest Comets in History: Broom Stars and Celestial Scimitars. New York: Springer Science+Business Media. ISBN 978-0-387-09512-7.
- ↑ Grun, Bernard (1991). The Timetables of History (3rd ed.). New York: Simon & Schuster. p. 245. ISBN 0-671-74919-6.
- ↑ Charton, Barbara (2003). A to Z of marine scientists. Infobase Publishing. ISBN 978-0-8160-4767-3.