APA-Zitierstil (7. Ausg.)

Hershler, R. (1994). A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Institution Press.

Chicago-Zitierstil (17. Ausg.)

Hershler, Robert. A Review of the North American Freshwater Snail Genus Pyrgulopsis (Hydrobiidae). Washington, DC: Smithsonian Institution Press, 1994.

MLA-Zitierstil (9. Ausg.)

Hershler, Robert. A Review of the North American Freshwater Snail Genus Pyrgulopsis (Hydrobiidae). Smithsonian Institution Press, 1994.