APA (7th ed.) Citation

ebrary, Inc, Perrin, W. F., Würsig, B. G., & Thewissen, J. G. M. (2009). Encyclopedia of marine mammals (2nd ed.). Academic.

Chicago Style (17th ed.) Citation

ebrary, Inc, W. F. Perrin, Bernd G. Würsig, and J. G. M. Thewissen. Encyclopedia of Marine Mammals. 2nd ed. London: Academic, 2009.

MLA (9th ed.) Citation

ebrary, Inc, et al. Encyclopedia of Marine Mammals. 2nd ed. Academic, 2009.