1. European Commission: Renewable Energy Directive 2009/28/EC RED, 23.04.2009
2. Renewable Fuel Standard Program (RFS2) Regulatory Impact Analysis, United States Environmental Protection Agency, http://www.epa.gov/otaq/renewablefuels/420r10006.pdf, (downloaded 09.03.2010)
3. Energy Information Administration (EIA), International Energy Statistics, Biofuels Production, Fuel Ethanol, 2000-2009,
4. http://ethanolrfa.org/pages/World-Fuel-Ethanol-Production, (downloaded 06.10.2011)
5. Energy Information Administration (EIA), International Energy Annual Energy Review 2009, DOE/ EIA-0384(2009), Release Date: August 19, 2010