1. Simultaneous Input Demands and Land Allocation in Agricultural Production under Uncertainty;Babcock;Western Journal of Agricultural Economics,1987
2. Nitrogen Loss Pathways and Nitrogen Loss Inhibitors: A Review;Scharf;Journal of Fertilizer Issues,1988
3. Virginia Cooperative Extension Service. 2000. “Agronomy Handbook.” Publication No. 424-100. Virginia Cooperative Extension Service, Blacksburg, VA.
4. BMP Challenge. 2007. “Take the BMP Challenge.” Available at http://www.bmpchallenge.org/index.htm (accessed March 6, 2007).
5. SAS. Undated. “SAS/STAT® Software.” Available at http://www.sas.com/technologies/analytics/statistics/stat/index.html (accessed September 20, 2006).