1. Renewable Fuels Agency:The Gallagher Review of the Indirect Effects of Biofuels Production. Renewable Fuels Agency, Surrey, UK.
2. Renewable Fuels Agency.Year one of the RTFO: renewable fuels agency report on the renewable transport fuel obligation 2008/09. Renewable Fuels Agency, Surrey, UK (2010).
3. European Parliament. Directive 2009/28/ec of the European Parliament and of the Council on the Promotion of the Use of Energy from Renewable Sources (2009).
4. Ethanol's Energy Return on Investment: A Survey of the Literature 1990−Present
5. The Royal Society.Sustainable Biofuels: Prospects and Challenges. Royal Society. London, UK (2008).