The Autochthonous North American musk oxen bootherium, symbos, and gidleya (mammalia artiodactyla bovidae) - McDonald, Jerry N.; Ray, Clayton E. (Clayton Edward); Smithsonian Institution (Washington : Smithsonian Institution Press, 1989)
Bibliography : p. 74-77
Keywords: Muskox, Fossil -- North America -- Classification; Paleontology -- North America