Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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