1. Code of Federal Regulations, 2000, http://www.access.gpo.gov/su_docs/
2. Food and Drug Administration, 1993, Federal Register, January 6, 1993, 55, 2302
3. Food and Drug Administration, 1999, Federal Register, November 17, 1999, 64, 62 746, http://www.access.gpo.gov/su_docs/
4. Guthrie, J. F. Derby, B. M. Levy, A. S. 1999, What people know and do not know about nutrition, America's Eating Habits: Changes and Consequences, E. Frazao, 243, 280, U.S. Department of Agriculture, Economic Research Service, Food and Rural Economics Division, April 1999