1. Bourlière, F. (1959). In “The Lifespan of Animals” (G.E.W. Wolstenholme and M. O'Connor, eds., CIBA Found. Colloq. on Aging, Vol. 5, p. 90.
2. Ageing: The Biology of Senescence;Comfort,1964
3. The Coming of Age;De Beauvoir,1972
4. Senescence as an Adaptive Trait