↑ Evolution of Tertiary Mammals of North America: Terrestrial animals of North America Volume 1, Terrestrial Carnivores, Ungulates, and Ungulate like Mammals. Christine M. Janis carnivores. Louis L. Jacobs, Kathleen Marie Scott.
↑ J. T. Gregory. 1942. University of California Publications, Bulletin of the Department of Geological Sciences 26(4)
↑ S. D. Webb. 1969. University of California Publications in Geological Sciences 78
↑ S. Legendre dan C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology 1(1):85-98