1. Energy Independence and Security Act of 2007 , Public Law 110-140, 2007; http://www.gpo.gov/fdsys/pkg/BILLS-110hr6enr/pdf/BILLS-110hr6enr.pdf
2. EPA , EPA Proposes 2011 Renewable Fuels Standards (RFS2), http://www.epa.gov/otaq/fuels/renewablefuels/index.htm
3. Renewable Fuel Standard (RFS2): Final Rule. 40 CFR Part 80, 2010; http://www.epa.gov/renewable-fuel-standard-program/renewable-fuel-standard-rfs2-final-rule#additional-resources
4. U.S. Department of Energy , Federal Laws and Incentives, http://www.afdc.energy.gov/laws/fed_summary
5. Cranfield University