Georges Louis Leclerc comte de Buffon (1817). “A Natural History, General and Particular: Containing the History and Theory of the Earth, a General History of Man, the Brute Creation, Vegetables, Minerals, Etc. Etc”, p.128
"Energy Resources and Our Future". Remarks at a Banquet of the Annual Scientific Assembly of the Minnesota State Medical Association, www.resilience.org. May 14, 1957.