1. US Energy Information Administration, Annual Energy Review 2010 to be Found Under http://www.eia.gov/totalenergy/data/annual/index.cfm (accessed March 2012).
2. The Hydrogen Economy. Opportunities and Challenges,2009
3. International Energy Agency, Key World Energy Statistics to be Found Under http://www.iea.org/textbase/nppdf/free/2011/key_world_energy_stats.pdf (accessed February 2012).
4. Biofuels. Securing the Planet's Future Energy Needs;Demirbas,2009
5. Gasoline, Diesel, and Ethanol Biofuels from Grasses and Plants;Gupta,2010