1. United States Department of Agriculture-National Agricultural Statistics Service. National statistics. http://www.nass.usda.gov. Consulted on August 21, 2008, verified on March 23, 2009.
2. First United Ethanol. http://www.firstunitedethanol.com. Consulted September 8, 2008, verified on March 23, 2009.
3. Fuel-cycle fossil energy use and greenhouse gas emissions of fuel ethanol produced from U.S. Midwest corn;Wang,1997
4. Ethanol as fuel: energy, carbon dioxide balances, and ecological footprint;Dias de Oliveira;BioScience,2005
5. Future biomass energy supply: the consumptive water use perspective;Berndes;International Journal of Water Resources Development,2008