"if the adverse genic effects appeared earlier in one system than any other, they would be removed by selection from that system more readily than from any other. In other words, natural selection will always be in greatest opposition to the decline of the most senescence-prone system."

• Williams, G.C. 1966. Adaptation and Natural Selection Princeton University Press, Princeton, N.J.
• Williams, G.C., ed. 1971. Group Selection Aldine-Atherton, Chicago.
• Williams, G.C. 1975. Sex and Evolution. Princeton University Press, Princeton, N.J.
• Paradis, J. and G.C. Williams. 1989. T.H. Huxley’s Evolution and Ethics : with New Essays on its Victorian and Sociobiological Context. Princeton University Press, Princeton, N.J.
• Williams, G.C. 1992. Natural Selection: Domains, Levels, and Challenges. Oxford University Press, New York.
• Nesse, R.M. and G.C. Williams. 1994. Why We Get Sick : the New Science of Darwinian Medicine. Times Books, New York.
• Williams, G.C. 1996. Plan and Purpose in Nature. Weidenfeld & Nicolson, London (published in the U.S. in 1997 as The Pony Fish’s Glow : and Other Clues to Plan and Purpose in Nature. Basic Books, New York).

• Williams, G. C. 1957. Pleiotropy, Natural Selection, and the Evolution of Senescence. Evolution 11;4: 398-411
• Taylor, P. O. and G. C. Williams. 1984. Demographic parameters at evolutionary equilibrium. Canadian Journal of Zoology 62: 2264-2271.
• Williams, G. C. 1985. A defense of reductionism in evolutionary biology. Oxford Surveys in Evolutionary Biology 2: 127.
• Williams, G. C. 1988. Huxley's Evolution and Ethics in sociobiological perspective. Zygon 23: 383-438.
• Williams, G. C. 1995. A package of information In J. Brockman, ed., The Third Culture, New York: Touchstone, pp. 38-50.