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Whales, Whaling, and Ocean Ecosystems; page 70. By James A. Estes, published 2007; University of California Press. ISBN 0-520-24884-8 Retrieved on July 1, 2020 /wiki/ISBN_(identifier)
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Marine Mammals: Evolutionary Biology; page 62. By Annalisa Berta, James L. Sumich, and Kit M. Kovacs, published 2005; Academic Press. ISBN 0-12-088552-2 Retrieved on July 1, 2008. /wiki/ISBN_(identifier)
"Cetacea, Indeterminate. Distribution of Animal Family Through Time". www.courtenaymuseum.ca. Archived from the original on October 23, 2007. Retrieved 2008-07-01. https://web.archive.org/web/20071023154018/http://www.courtenaymuseum.ca/paleo/paleo/cetacea.html