APA (7th ed.) Citation

Knapp, E., Krebs, A., & Wildermuth, H. (1983). Libellen.

Chicago Style (17th ed.) Citation

Knapp, Egon, Albert Krebs, and Hansruedi Wildermuth. Libellen. Schaffhausen, 1983.

MLA (9th ed.) Citation

Knapp, Egon, et al. Libellen. 1983.

Warning: These citations may not always be 100% accurate.