1. Butler, R., 2007. Biofuels driving destruction of Brazilian cerrado. Mongabay Press release. 〈http://news.mongabay.com/2007/0821-cerrado.html〉 (21 August, 2007)
2. Clark, G., 2009. Biofuels sustainability scorecard updated by IDB. Biofuel Review. 〈http://www.biofuelreview.com/content/view/1988/1/〉 (Monday, 14 September 2009).
3. European Commission, 2009. Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC. Official Journal of the European Union, L140/16, 5 June 2009.
4. The State of Food and Agriculture 2008, BIOFUELS: Prospects, Risks and Opportunities;FAO,2008