M. Scott Peck (2002). “The Road Less Traveled, 25th Anniversary Edition: A New Psychology of Love, Traditional Values, and Spiritual Growth”, p.67, Simon and Schuster
"The Energy Crisis - Why Our World Will Never Again Be the Same". Margaret Mead, "Redbook", 1974, later quoted in Hugh Nash "Progress As If Survival Mattered: A Handbook For A Conserver Society" (p. 166), 1977.