Jefferson, T. A., Webber, M. A., Gorter, U., & Pitman, R. L. (2015). Marine mammals of the world: A comprehensive guide to their identification. Elsevier Science.
Chicago-viite (17. p.)Jefferson, Thomas A., Marc A. Webber, Uko Gorter, ja Robert L. Pitman. Marine Mammals of the World: A Comprehensive Guide to Their Identification. San Diego, CA: Elsevier Science, 2015.
MLA-viite (8. p.)Jefferson, Thomas A., et al. Marine Mammals of the World: A Comprehensive Guide to Their Identification. Elsevier Science, 2015.
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