Literature
  • Riedman 1990b
  • Sea Otters. Monterey Bay Aquarium, Monterey, California. 80 pp.
  • 1982
  • Seals and Man: A Study of Interactions. University of Washington Press, Seattle. 170 pp.
  • 1983
  • Seals of the World. (Second Edition) Cornell University Press, Ithaca, New York. 240 pp.