1. Agricultural Marketing Service (AMS) (2000a). Final Rule. National Organic Program, USDA, 7 CFR, Part 205. Washington, DC: USDA.
2. Agricultural Marketing Service (AMS) (2000b). National Organic Program Overview. National Organic Program, USDA. Washington, District of Columbia: USDA. Accessed on October 13, 2005 at http://www.ams.usda.gov/nop/factsheets/overviewe.html.
3. Agricultural Marketing Service (AMS, 2003). National List Information. National Organic Program, Washington DC: USDA. Accessed on October 13, 2005 at http://www.ams.usda.gov/nop/NationalList/ListHome.html.