MLA

Jefferson, Thomas A, et al. Marine Mammals of the World : a Comprehensive Guide to Their Identification. Academic Press, 2015.

APA

Jefferson, T. A, Jefferson, T. Allen, Jefferson, T. Allen A, Pitman, R., Pitman, R. L, & Webber, M. A. (2015). Marine mammals of the world : a comprehensive guide to their identification. Academic Press.

Chicago

Jefferson, Thomas A., Thomas Allen Jefferson, Thomas Allen A Jefferson, Robert Pitman, Robert L Pitman, and Marc A Webber. Marine Mammals of the World : a Comprehensive Guide to Their Identification. : Academic Press, 2015.