Wing, Scott L. 1998. "
Tertiary Vegetation of North America as a Context for Mammalian Evolution." In
Evolution of Tertiary Mammals of North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals. Janis, Christine M., Scott, Kathleen M., and Jacobs, Louis L., editors. 37–60. Cambridge, UK: Cambridge University Press.