Waring, G.T and D.L. Palka. 2002. North Atlantic marine mammals. In: Perrin, WE; Wursig, B; Thewissen, JGM, eds. Encyclopedia of Marine Mammals. New York, NY: Academic Press; p. 802-805.

Waring, G.T., E. Josephson, K. Maze-Foley, and P.E. Rosel. 2009. U.S. Atlantic and Gulf of Mexico Marine Mammal Stock Assessments -- 2009. Technical Memorandum NMFS-NE-213