Greger, M. (2012). The Welfare of Transgenic Farm Animals. (R. Sammour, Ed.).Biotechnology - Molecular Studies and Novel Applications for Improved Quality of Human Life, 45–64. https://doi.org/10.5772/2519
Porter, V., & Mason, I. L. (2002). Mason’s World Dictionary of Livestock Breeds, Types and Varieties (5th ed.). Wallingford, Oxfordshire, UK: CABI Publishing.
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.
Zeller, J. H. (1955). Breeds of Swine. Washington, DC: U.S. Dept. of Agriculture.
