APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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