↑ 2.02.12.22.32.42.52.6Rice, Dale W. (1998) Marine Mammals of the World: Systematics and Distribution, Special Publications of the Society for Marine Mammals, no. 4
↑ 3.03.13.23.33.43.53.6Wilson, Don E., and DeeAnn M. Reeder, eds. (2005) , Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vols. 1 & 2
↑Wilson, Don E., and DeeAnn M. Reeder, eds. (1992) , Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing