1. Stacy C. Davis and Susan W. Diegel, Transportation Energy Data Book, 25th Edition, ORNL-6974 (2006).
2. Kenneth S. Deffeyes, Hubbert’s Peak: The Impending World Oil Shortage, revised edition (Princeton, NJ: Princeton University Press, 2001).
3. Michael T. Klare, Resource Wars: The New Landscape of Global Conflict (New York: Henry Holt and Company, 2002).
4. Vaclav Smil, Energy at the Crossroads: Global Perspectives and Uncertainties (Cambridge, MA: MIT Press, 2003).
5. Paul Roberts, The End of Oil: On the Edge of a Perilous New World (Boston, MA: Houghton Mifflin, 2004).