9Greene,Catherine.2006.U,S.Organic Agriculture.Agricultural Resources and Environmental Indicators ,2006 Edition/EIB- 16 [EB/OL].http:// www.ers.usda.gov/publications/arei/eib l 6/Chapter4/4.9/.2009-11-05.
10Economic Research Servie:YUSDA.2009:rew Directions in U:S.Organic Policy.Emerging Issues in the U.S.Organic Industry/EIB-55 [EB/OL]. http://www.ers.usda.gov/publications/eib55/eib55d.pdf.2009-11-05.