The Autochthonous North American Musk Oxen Bootherium, Symbos and Gidleya (Mammalia : Artiodactyla : Bovidae) - McDonald, Jerry N. (Smithsonian Institution Press, 1989)
En : Smithsonian contributions to paleobiology.– Washington, D.C. : Smithsoniam Institution Press, 1969- no. 66(1989)