- E. Burgess, Return to the Red Planet 127 (1990).
- Beyond Spaceship Earth: Environmental Ethics and the Solar
System, ed. E. C. Hargrove (San Francisco: Sierra Club Books,
1986)
- G. Feinberg, R. Shapiro, Life Beyond Earth: The Intelligent
Earthling's Guide to Life in the Universe (1980).
- Norman H. Horowitz, To Utopia and Back (1986).
- Carl Sagan, Cosmos (New York: Random House, 1980)
- Carl Sagan, The Cosmic Connection (New York: Double Day,
1973)
- Quest For Extraterrestrial Life, Mill Valley: University
Science Book (Donald Goldsmith, ed. 1980)
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