(EN) D.E. Wilson e D.M. Reeder, Ovis ammon, in Mammal Species of the World. A Taxonomic and Geographic Reference, 3ยช ed., Johns Hopkins University Press, 2005, ISBN0-8018-8221-4.
Bunch et al.: Chromosome number of Severtzov's sheep (Ovis ammon severtzovi): G-banded karyotype comparisons within ovis. Journal of Heredity, 1998. Abstractonline PDF
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Bunch et al.: Chromosome number of Severtzov's sheep (Ovis ammon severtzovi): G-banded karyotype comparisons within ovis. Journal of Heredity, 1998. Abstractonline PDF