Geschreven door Aline Joustra, student Kust en Zeemanagement (Van Hall Larenstein) en Wolter Stam, Marien Bioloog

F.H. Fay, 1982. Ecology and Biology of the Pacific Walrus, Odobenus rosmarus divergens Illiger. North American Fauna, vol. 74, pp. 1-279.
R.R. Reeves et al - a, 2002. Pinnipeds, Guide to Marine Mammals of the World (pp. 49-53). New York, National Audubon Society.
R.R. Reeves et al - b, 2002. True Seals, Guide to Marine Mammals of the World (pp. 114-179). New York, National Audubon Society.
R.R. Reeves et al - c, 2002. Eared seals, Guide to Marine Mammals of the World (pp. 58-109). New York, National Audubon Society.
R.R. Reeves et al - d, 2002. Walrus, Guide to Marine Mammals of the World (pp. 110-113). New York, National Audubon Society.
Tree of Life, 2000. Carnivora. Retrieved from: http://tolweb.org/Carnivora/15971

Afbeeldingen van Pixabay en Wikimedia Commons