Jianlin, H. (2014). "Wild yak (Bos mutus Przewalski, 1883)". In Melleti, M.; Burton, J. (eds.). Ecology, Evolution and Behavior of Wild Cattle: Implications for Conservation. Cambridge: Cambridge University Press. p.194–215. doi:10.1017/CBO9781139568098.014.
Olsen, S. J. (1990). "Fossil ancestry of the Yak, its cultural significance and domestication in Tibet". Proceedings of the Academy of Natural Sciences of Philadelphia. 142: 73–100. JSTOR4064972.