1. Organic Agriculture
2. Organic Agriculturehttp://www.fao.org/unfao/bodies/COAG/COAG15/X0075E.htm#P99_8218
3. IFOAM International Federation of Organic Agriculture Annual Report 2007,2007
4. Report and Recommendations on Organic Farming,1980
5. Organic Agriculture. Organic Policyhttp://www.ers.usda.gov/topics/natural-resources-environment/organic-agriculture/organic-policy.aspx