N.G. Dmitriev, L.K. Ernst (1989). Animal genetic resources of the USSR. FAO animal production and health paper 65. Rome: Food and Agriculture Organization of the United Nations. ISBN9251025827. Archived 13 November 2009. Also available here, archived 29 September 2017.
Sovetskii Tyazhelovoz/Russian Federation. Domestic Animal Diversity Information System of the Food and Agriculture Organization of the United Nations. Accessed June 2017.
web.archive.org
N.G. Dmitriev, L.K. Ernst (1989). Animal genetic resources of the USSR. FAO animal production and health paper 65. Rome: Food and Agriculture Organization of the United Nations. ISBN9251025827. Archived 13 November 2009. Also available here, archived 29 September 2017.