FAO (Food and Agriculture Organization of the United Nations). 2006. Livestock’s Long Shadow— Environmental Issues and Options. Rome, Italy: FAO.
FAO. 2009a. How to Feed the World in 2050. Rome, Italy: FAO.
FAO. 2009b. The State of Food Insecurity in the World 2009. Rome, Italy: FAO.
FAO. 2010. Greenhouse Gas Emissions from the Dairy Sector: A Life Cycle Assessment. Rome, Italy: FAO.
Rischkowsky, B. and D. Pilling. 2007. The State of the World’s Animal Genetic Resources for Food and Agriculture. Rome, Italy: Commission on Genetic Resources for Food and Agriculture.
U.S. Environmental Protection Agency. 2010. What is Sustainability? Available at http://www.epa.gov/Sustainability/basicinfo.htm. Accessed March 2010.
USDA (U.S. Departmentment of Agriculture). 1978. Livestock Slaughter Annual Summary 1977. Washington, DC: USDA.
USDA National Agricultural Statistics Service. 2008. Livestock Slaughter 2007 Summary. Washington, DC: USDA.