REFERENCES

Graur, D. and D.G. Higgins. 1994. Molecular Evidence for the Inclusion of Cetaceans within the Order Artiodactyla. Molecular Biology and Evolution 11(3):357-364.

Janis, C.M., K.M. Scott, and L.L. Jacobs (eds.) 1998. Evolution of Tertiary Mammals of North America. Vol. 1: Terrestrial Carnivores and Ungulates. Cambridge University Press, Cambridge, UK. 691 pp.