1. Chaisson, E. 1981. Cosmic Dawn: The Origins of Matter and Life. Little, Brown and Co., Boston.
2. Chaisson, E., 2001. Cosmic Evolution: The Rise of Complexity in Nature. Harvard University Press, Cambridge, Mass.
3. Crowe, M. J., 1986. The Extraterrestrial Life Debate, 1750-1900: The Idea of a Plurality of Worlds from Kant to Lowell. Cambridge University Press, Cambridge; Dover reprint, 1999.
4. Darling, D., 2001. Life Everywhere: The Maverick Science of Astrobiology. Basic Books, New York.
5. Davies, P., 1995. Are We Alone? Philosophical Implications of the Discovery of Extraterrestrial Life. Basic Books, New York.