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http://www.eia.gov/biofuels/issuestrends/pdf/bit.pdf
(US Department of Energy, October 2012).
2. McPhail, L., Westcott, P. & Lutman, H. The Renewable Identification Number System and US Biofuel Mandates.
http://www.ers.usda.gov/media/138383/bio03.pdf
(US Department of Agriculture, November 2011).
3. American Petroleum Institute, Petitioner, v. Environmental Protection Agency United States, No. 12-1139 (DC Cir. 2013).
http://www.cadc.uscourts.gov/internet/opinions.nsf/A57AB46B228054BD85257AFE00556B45/$file/12-1139-1417101.pdf
4. Environmental Protection Agency. EPA proposes 2013 renewable fuel standards.
http://www.epa.gov/otaq/fuels/renewablefuels/documents/420f13007.pdf
(EPA, January 2013).
5. US Energy Information Administration. International Energy Outlook 2013
http://www.eia.gov/forecasts/ieo/pdf/0484(2013).pdf
(US Department of Energy, May 2013).