The Search for Life in the Universe, by D.Goldsmith and T.Owen, Addison Wesley, 2nd edition
Foundations of Astronomy by M. Seeds, Wadsworth Publishing Co.
The Big Bang, by J.Silk, Freeman and Co.
Probability 1: Why There Must Be Intelligent Life in the Universe, by A.D.Aczel, Harcourt Brace
The Search for Life on Other Planets, by B.Jakosky, Cambridge University Press
Specific printed or on-line sources hav been cited in the document pages comprising the "SETI module".