1. AAFCO (1994) Official publication of the Association of American Feed Control Officials. Inc., Atlanta, GA
2. AAFCO (1995) Official publication of the Association of American Feed Control Officials. Inc., Atlanta, GA
3. AAFCO (2004) Official publication of the Association of American Feed Control Officials. Inc., Atlanta, GA
4. Aldrich G (2006) Rendered products in pet food. Essential rendering all about the animal by-products industry. National Renderers Association, Kirby Lithographic Co., Inc. Arlington, Virginia, www.rendereres.org , accessed on 20.1.2007, p 158–177
5. Anon (1978) Food Safety and Inspection Service, USDA, www.usda.org accessed on 15.4.2007