Norman Borlaug's 30th anniversary lecture at the Norwegian Nobel Institute in Oslo (September 8, 2000), as quoted in Ronald Bailey "Global Warming and Other Eco Myths: How the Environmental Movement Uses False Science to Scare Us to Death" (p. 59), 2002.
Warren Farrell (2005). “Why Men Earn More: The Startling Truth Behind the Pay Gap--and what Women Can Do about it”, p.191, AMACOM Div American Mgmt Assn