1. Your Guide to Understanding Energy;U.S. Energy Information Administration (US EIA),2011
2. Greenhouse Gases' Effect on the Climate;U.S. Energy Information Administration (US EIA),2011
3. Oil Imports and Exports;U.S. Energy Information Administration (US EIA),2011
4. EPA Finalizes Regulations for the National Renewable Fuel Standard Program for 2010 and Beyond;United States Environmental Protection Agency (US EPA),2010
5. Biodiesel from microalgae;Chisti;Biotechnology Advances,2007