1. Carroll, S.M., Press, W.H. and Turner, E.L. (1992). ARA&A, 30, 499.
2. Gamow, G. (1970). My World Line. New York: Viking Press.
3. Gunn, J.E. (1978). In Observational Cosmology by J.E. Gunn, M.S. Longair and M.J. Rees. Geneva: Geneva Observatory Publications.
4. Kolb, E.W. and Turner, M.S. (1990). The Early Universe, Redwood City, California: Addison-Wesley Publishing Co.
5. Longair, M.S. (1992). Theoretical Concepts in Physics, Cambridge: Cambridge University Press.