Briggs, H.M. and Briggs, D.M. (1980). Modern Breeds of Livestock. Macmillan Publishing.
International Commission on Zoological Nomenclature. 2003. Opinion 2027 (Case 3010). Usage of 17 specific names based on wild species which are pre-dated by or contemporary with those based on domestic animals (Lepidoptera, Osteichthyes, Mammalia): conserved. Bull.Zool.Nomencl., 60:81-84.
Van Vuure, Cis. 2003. De Oeros – Het spoor terug, Cis van Vuure, Wageningen University and Research Centrum / Ministry of the Flemish Community, Brussels & Wageningen.
Zong, G. 1984. A record of Bos primigenius from the Quaternary of the Aba Tibetan Autonomous Region. Vertebrata PalAsiatica, Volume XXII No. 3 pp. 239–245. Translated by Will Downs, April 1991. Online pdf (62 kB)