1. US Department of Energy/Energy Efficiency and Renewable Energy website. www.fueleconomy.gov
2. White House Office of Communications Twenty in Ten: Strengthening America's Energy Security 2007 http://www.energy.gov/media/20in10FactSheet.pdf
3. US Department of Energy Breaking the Biological Barriers to Cellulosic Ethanol [Online] 2006 http://genomicscience.energy.gov/biofuels/b2bworkshop.shtml#page=news
4. EPA Energy Independence and Security Act of 2007: Key Provisions Affecting Combined Heat and Power [Online] 2007 http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi?dbname=110_cong_bills&docid=f:h6enr.txt.pdf
5. UOP Honeywell Green Jet Fuel™ powers Royal Netherlands Air Force helicopter. 2010 http://www.uop.com/pr/releases/RNLAF%20Rotorcraft%20Biofuels%20Flight%20-%20FINAL.pdf