1. U.S. Department of Energy (DOE), Energy Information Administration (EIA), Annual Energy Review 2005, DOE/EIA-0384(2005), National Energy Information Center, Washington, DC, July 2006.
2. The Advanced Energy Initiative (AEI), National Economic Council, February 2006.
3. The National Association of Manufacturers (NAM), message by NAM President John Engler, November 2005, http://www.nam.org/s_nam/doc1.asp?CID=202310&DID=235622.
4. S.C. Davis, S.W. Siegel, Transportation Energy Data Book, Edition 25, ORNL-6974, Center for Transportation Analysis, Oak Ridge National Laboratory, Oak Ridge, TN, 2006.
5. U.S. Department of Energy (DOE), Energy Information Administration (EIA), Annual Energy Outlook 2006 with Projections to 2030, DOE/EIA-0383(2006), National Energy Information Center, Washington, DC, February 2006.