Dohner, J. V. (2001). The Encyclopedia of Historic and Endangered Livestock and Poultry Breeds. New Haven, CT: Yale University Press.
Porter, V., Alderson, L., Hall, S. J. G., & Sponenberg, D. P. (2016). Mason’s World Encyclopedia of Livestock Breeds and Breeding: 2 Volume Pack (1st ed.). Wallingford, Oxfordshire, UK: CABI.