Snow, A. A., D. A. Andow, P. Gepts, E. M. Hallerman, A. Power, J. M. Tiedje, and L. L. Wolfenbarger. 2005. Genetically engineered organisms and the environment: Current status and recommendations. Ecological Applications 15:377-404.
USDA/ERS (U.S. Department of Agriculture/Economic Research Service). 2010. Food Dollar Series.http://www.ers.usda.gov/data-products/food-dollar-series/food-dollar-application.aspx (accessed September 10, 2012).
———. 2011a. A revised and expanded food dollar series: A better understanding of our food costs, ERR-114. Washington, DC: USDA.
———. 2011b. Have food commodity prices risen again?, WRS 1103. Washington, DC: USDA.
———. 2011c. Impacts of higher energy prices on agriculture and rural economies, ERR-123. Washington, DC: USDA.