Peter Grubb, "Artiodactyla,". Mammal Species of the World, (3rd ed.), Volume 1, Don E. Wilson & DeeAnn M. Reeder (ed.), Johns Hopkins University Press, 2005, Pages 637-722.
doi.org
Harris, R.B. & Tsytsulina. K. 2008. Ovis nivicola. The IUCN Red List of Threatened Species 2008: e.T15740A5076357. doi:10.2305/IUCN.UK.2008.RLTS.T15740A5076357.en, Downloaded on 14 August 2017.