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Pompa, S.; Ehrlich, P. R.; Ceballos, G. (2011-08-16). "Global distribution and conservation of marine mammals". Proceedings of the National Academy of Sciences108 (33): 13600–13605. doi:10.1073/pnas.1101525108. Bibcode: 2011PNAS..10813600P.
Uhen, M. D. (2007). "Evolution of marine mammals: Back to the sea after 300 million years". The Anatomical Record290 (6): 514–22. doi:10.1002/ar.20545. பப்மெட்:17516441.