See W. N. Kellogg, Porpoises and Sonar (1961); K. S. Norris, ed., Whales, Dolphins and Porpoises (1966); E. Devine and M. Clark, The Dolphin Smile (1967); R. Stenuit, The Dolphin, Cousin to Man (1968); D. K. and M. C. Caldwell, The World of the Bottlenosed Dolphin (1972); M. M. Bryden and R. Harrison, ed., Research on Dolphins (1986); R. Ellis, Dolphins and Porpoises (1989).

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