Berta, Annalisa; Churchill, Morgan; Boessenecker, Robert W. (2018-05-30). “The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses”. Annual Review of Earth and Planetary Sciences (Annual Reviews) 46 (1): 203–228. Bibcode: 2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009. ISSN0084-6597.
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Berta, Annalisa; Churchill, Morgan; Boessenecker, Robert W. (2018-05-30). “The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses”. Annual Review of Earth and Planetary Sciences (Annual Reviews) 46 (1): 203–228. Bibcode: 2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009. ISSN0084-6597.
“Otary, n., etymology of” The Oxford English Dictionary. 2nd ed. 1989. OED Online. Oxford University Press. http://dictionary.oed.com/ Accessed November 2007
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Berta, Annalisa; Churchill, Morgan; Boessenecker, Robert W. (2018-05-30). “The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses”. Annual Review of Earth and Planetary Sciences (Annual Reviews) 46 (1): 203–228. Bibcode: 2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009. ISSN0084-6597.