1. Anon (U S Energy Information Administration) International Energy Statistics 2011 http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=5&pid=5&aid=2
2. Anon Renewable Fuels Association Statistics 2011 http://ethanolrfa.org/pages/statistics
3. Anon (Environmental Protection Agency) Renewable Fuel Standard Implementation: Frequently Asked Consumer Questions 2007 http://www.epa.gov/oms/renewablefuels/420f07062.htm
4. E15 (a blend of gasoline and ethanol) 2011 http://www.epa.gov/otaq/regs/fuels/additive/e15/
5. Anon (Environmental Protection Agency) Federal Energy Requirements 2011 http://www.epa.gov/oaintrnt/energy/fedreq.htm