1. BP Statistical Review of World Energy. http://www.bp.com/statisticalreview.Cited June 10, 2010.
2. M. King Hubbert, Nuclear Energy and Fossil Fuels (Shell Development Co., Exploration and Production Research Division, Houston, 1956).
3. C. Campbell and J. Laherrere, “The End of Cheap Oil,” Scientific American, no. 3 (1998).
4. The Oil Crunch, Report of the Industry Taskforce on Peak Oil & Energy Security (ITPO), February 10, 2010.
5. J. Laherrere, “When Will Oil Production Decline Significantly?” European Geosciences Union General Assembly 2006. http://www.hubbertpeak.com/laherrere/EGUVienna 2006.pdf .