↑ 1.01.1Rice, Dale W. (1998) Marine Mammals of the World: Systematics and Distribution, Special Publications of the Society for Marine Mammals, no. 4
↑ 2.02.12.2Mead, James G., and Robert L. Brownell, Jr. / Wilson, Don E., and DeeAnn M. Reeder, eds. (2005) Order Cetacea, Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vol. 1
↑ 3.03.1Wilson, Don E., and DeeAnn M. Reeder, eds. (1992) , Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing
↑ (2001) , website, U. S. Fish and Wildlife Service Endangered Species Program