Delgado C, Rosegrant M, Steinfeld H, et al. Livestock to 2020: the next food revolution. Food, Agriculture, and the Environment discussion paper 28. Washington, DC: International Food Policy Research Institute, 1999.
Taylor LH, Latham SM, Woolhouse ME. Risk factors for human disease emergence. Philos Trans R Soc Lond B Biol Sci 2001;356:983–989.
Brown JP, Silverman JD. The current and future market for veterinarians and veterinary medical services in the United States: executive summary. J Am Vet Med Assoc 1999;215;161–183.