1. http://www.treehugger.com/cars/biodiesel-how-its-made-environmental-impact-where-to-find-a-fueling-station-and-more.html
2. http://www.serconline.org/biodiesel/fact.html
3. http://www.greenamerica.org/livinggreen/biodiesel.cfm
4. http://www.biodiesel.com/index.php/company/about_pacific_biodiesel_inc
6. http://www.revbiodiesel.com/index.html
7. http://www.alternative-energy-news.info/advantages-biodiesel-fuel-transportation/
8. http://www.e-ir.info/2008/02/10/the-politics-of-renewable-energy-unintended-consequences-of-biofuel-policies/
9. http://www.gmwatch.org/index.php?option=com_content&view=article&id=12055
