1. US Department of Agriculture, Food Safety Inspection Service, Office of Policy, Program Development and Evaluation. Cooperative State Meat and Poultry Inspection Programs. Available at: www.fsis.usda.gov/oppde/fslgrs/state.htm. Accessed September 2002.
2. Packers and stockyards statistical report, 2000 reporting year;US Department of Agriculture, Grain Inspection, Packers and Stockyards Administration, Packers and Stockyards Programs,2002
3. Livestock slaughter: 2000 Summary;National Agricultural Statistics Service,2001
4. Industrial market structure and economic performance;Scherer,1990
5. Consolidation in US meatpacking;MacDonald,2000