Porter, V., & Mason, I. L. (2002). Mason’s World Dictionary of Livestock Breeds, Types and Varieties (5th ed.). Wallingford, Oxfordshire, UK: CABI Publishing.
SHRESTHA, J. N. B., & HANSEN, C. (Eds.). (1997). Canada’s Animal Genetic Resources: Cattle Breeds in Canada. Ottawa, Canada: Research Branch, Agriculture and Agri-Food Canada.