Photo Courtesy of Gilbert Grosvenor, “Bell feeding sheep, a breed he studied at his estate to advance the studies of genetics.” on Alexander Graham Bell National Historic Site, the early 20th century
FAO. (1997). 2.2. RAZAS DESAPARECIDAS. Lista Mundial de Vigilancia para la Diversidad de los Animales Domésticos. (2a ÉDICIÓN). https://www.fao.org/4/V8300S/v8300s0s.htm (in French)
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.
