1. N.S. Lewis, Global Energy Perspective, 〈http://nsl.caltech.edu〉.
2. D.E. Arvizu, Meeting the renewable energy challenge: what will it take to reach solar PV's ultimate potential, in: Presented at the 2006 IEEE Fourth World Conference on Photovoltaic Energy Conversion in Waikoloa, Hawaii, NREL/PR-100-40011.
3. R.C. Duncan, W. Youngquist, The World Petroleum Life-Cycle, Based on the World Oil Forecasting Program, 〈http://www.dieoff.com/page133.pdf〉
4. Florida Today, May 29, 2006.
5. B. Bellemare, Solar boiling over, Utilipoint International Article, August 9, 2006.