1. Abelson, Philip. 1966. Chemical Events on the Primitive Earth. Proceedings of the National Academy of Sciences 55: 1365–1372.
2. Arrhenius, Svante. 1903. The distribution of life in space. Die Umschau.
3. ———. 1908. World in the making. New York: Harper and Row.
4. Ayres, Robert U. 1994. Information, entropy and progress. New York: American Institute of Physics.
5. Bernal, John Desmond. 1951. The physical basis of life. London: Routledge and Kegan Paul.