APA (7th ed.) Citation

Perrin, W. F., Würsig, B. G., & Thewissen, J. G. M. (2002). Encyclopedia of marine mammals. Academic Press.

Chicago Style (17th ed.) Citation

Perrin, William F., Bernd G. Würsig, and J. G. M. Thewissen. Encyclopedia of Marine Mammals. San Diego: Academic Press, 2002.

MLA (9th ed.) Citation

Perrin, William F., et al. Encyclopedia of Marine Mammals. Academic Press, 2002.