APA (7th ed.) Citation

Keen, A. M. (1952). Illustrated key to west North American gastropod genera. Stanford University Press.

Chicago Style (17th ed.) Citation

Keen, A. Myra. Illustrated Key to West North American Gastropod Genera. Stanford: Stanford University Press, 1952.

MLA (9th ed.) Citation

Keen, A. Myra. Illustrated Key to West North American Gastropod Genera. Stanford University Press, 1952.