3Mary Aheam,Jet Yee,Eldon Ball and Rich Nehring with contributions from Agapi Somwaru and Rachel Evans. Resource Economics Division, Economic Research Service, Agricultural Productivity in the United States, USDA. Agriculture Information Bulletin No.740
4Mathew Shane,Terry Roe and Munisamy Gopinath. U.S. Agricultural Growth and Productivity: An Economywide Perspective,Market and Trade Economics Division, Economic Research Service, USDA. Agricultural Economic Report No. 758
5Agricultural Income & Finance Outlook/AIS-80/March 11,2003,Economic Research Service, USDA
6FARMER COOPERATIVE STATISTICS. Department of Agriculture Rural Business-Cooperative Service. United States, 2000
7Pagliaro. John. Method for Conducting a Diagnostic Assessment of Wholesale/Retail Food Distribution Systems in Developing Countries. Prepared for USAID/Washington, Dana Associates, Fort Lee, New Jersey. 1984
8Fuglie, Keith, et al. Agricultural Research and Development: Public and Private Investments Under Alternative Markets and Institutions. Economic Research Service, AER-735. USDA, 1996
9L. Tim Wallace. Agriculture' s Futures-America' s Food System.Springer-Verlag, New York Inc, 1987: 19-29
10Beirlein James G. and others. Principles of Agribusiness Management. Waveland, 1995:17-23