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W. Christopher Wozencraft. Division of Natural Sciences, Bethel College, 1001 W. McKinley Ave., Mishawaka, IN 46545
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Rice, Dale W. 1998-01-01. Special Publications of the Society for Marine Mammals, no. 4. The Society for Marine Mammalogy. Lawrence, Kansas, USA. ix + 231. 1-891276-03-4. .
Wilson & Reeder, eds. (2005): Comments: Revised by King (1966). Reviewed by Davidson (1929), Briggs and Morejohn (1976), and Ling and Bryden (1992)