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Gentry, A.; Clutton-Brock, J.; Groves, C. P. (2004). "The naming of wild animal species and their domestic derivatives". Journal of Archaeological Science. 31 (5): 645. Bibcode:2004JArSc..31..645G. doi:10.1016/j.jas.2003.10.006.
Sarkar, M.; Das, D. N.; Mondal, D. B. (1999). "Fetal Haemoglobin in Pregnant Yaks (Poephagus grunniens L.)". The Veterinary Journal. 158 (1): 68–70. doi:10.1053/tvjl.1999.0361. PMID10409419.
Sarkar, M.; Prakash, B.S. (2005). "Timing of ovulation in relation to onset of estrus and LH peak in yak (Poephagus grunniens L.)". Animal Reproduction Science. 86 (4): 353–362. doi:10.1016/j.anireprosci.2004.08.005. PMID15766812.
Zi, X.D. (2003). "Reproduction in female yaks (Bos grunniens) and opportunities for improvement". Theriogenology. 59 (5–6): 1303–1312. doi:10.1016/S0093-691X(02)01172-X. PMID12527077.