APA (7th ed.) Citation

Scheffer, V. B., & Parnall, P. (1976). A natural history of marine mammals. Scribner.

Chicago Style (17th ed.) Citation

Scheffer, Victor B., and Peter Parnall. A Natural History of Marine Mammals. New York: Scribner, 1976.

MLA (9th ed.) Citation

Scheffer, Victor B., and Peter Parnall. A Natural History of Marine Mammals. Scribner, 1976.