Cita APA (7a ed.)

Jefferson, T. A., Webber, M. A., & Pitman, R. L. (2008). Marine mammals of the world: A comprehensive guide to their identification. Academic.

Cita Chicago Style (17a ed.)

Jefferson, Thomas A., Marc A. Webber, y Robert L. Pitman. Marine Mammals of the World: A Comprehensive Guide to Their Identification. London ; Burlington, MA: Academic, 2008.

Cita MLA (8a ed.)

Jefferson, Thomas A., et al. Marine Mammals of the World: A Comprehensive Guide to Their Identification. Academic, 2008.