Bibliography
- US Congress, 2007. Energy Independence and Security Act of 2007 www.whitehouse.gov/news/releases/2007/12/20071219–1.html
- 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 (text with European Environment Agency relevance) http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2009:140:0016:0062:EN:PDF
- BP and Dupont, 2006. Biobutanol fact sheet www.bp.com/liveassets/bp_internet/globalbp/STAGING/global_assets/downloads/B/Bio_biobutanol_fact_sheet_jun06.pdf