pygmy , dwarf sperm whales donald f. mcalpine in encyclopedia of marine mammals (2002), san diego: academic press, pp. 1007–1009, isbn 0-12-551340-2
whales dolphins , porpoises, mark carwardine, dorling kindersley handbooks, isbn 0-7513-2781-6
national audubon society guide marine mammals of world, reeves, stewart, clapham , powell, isbn 0-375-41141-0
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