Kaynak

195. Roger Lewin, Bones of Contention, The University of Chicago Press, 2nd edition, Chicago & London, 1997, s. 86.
196. Prof. Dr. Yalçın Şahin, Genel Biyoloji, Bilim Teknik Yayınevi, Eskişehir, 1995, s. 349.
197. David R. Pilbeam, "Rearranging Our Family Tree", Human Nature, June 1978, s. 45.
198. Earnest A. Hooton, Up From The Ape,McMillan, New York, 1931, s. 332.
199. Jacques Monod, Chance and Necessity, New York, 1971, s. 143.
200. John Horgan, "In the Beginning", Scientific American, vol. 264, February 1991, s. 119.
201. G. F. Joyce, L. E. Orgel, "Prospects for Understanding the Origin of the RNA World", In the RNA World, Cold Spring Harbor Laboratory Press, New York, 1993, s. 13.
202. Leslie E. Orgel, "The Origin of Life on the Earth", Scientific American, October 1994, vol. 271, s. 78..