Planetary Dreams

Robert Shapiro. Planetary Dreams: The Quest to Discover Life Beyond Earth. John Wiley and Sons, 1999.

Looking for Life

Carl Sagan. ( ed) Communication with Extraterrestrial Intelligence (CETI). MIT Press, 1976.

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A Beginners Guide To SETI

Edward Ashpole. The Search for Extraterrestrial Intelligence. Blandford Press, 1990.
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Imagining Aliens

Chris Boyce. Extraterrestrial Encounter: A Personal Perspective. David and Charles, 1979.
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Debating Drake

Carl Sagan. (ed) Communication with Extra Terrestrial Intelligence (CETI). MIT Press.
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SETI, the Inside Story

Seth Shostak. Confessions of an Alien Hunter: a Scientific Search for Extraterrestrial Intelligence. National Geographic, 2009.

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Still Searching for SETI

Bill Fawcett (editor). Making Contact: A Serious Handbook for Locating and Communicating with Extraterrestrials. William Morrow, 1997.

Life As We Know It

Stephen J. Dick. The Biological Universe: the Twentieth Century Extraterrestrial Life Debate and the Limits of Science. Cambridge University Press, 1996.

Albert A. Harrison. After Contact: The Human Response to Extraterrestrial Life. Plenum Trade, 1997.

Alien Evolution

Jack Cohen and lan Stewart. Evolving the Alien: The Science of Extraterrestrial Life. Ebury Press, 2002.

Here Be Dragons!

David Koerner and Simon LeVay. Here Be Dragons: The Scientific Quest for Extraterrestrial Life, Oxford University Press, 2000.

Talking to the Aliens

Andrz Kukla. Extraterrestrials: A Philosophical Perspective. Lexington Books, 2010.

Rare Earth

Peter D. Ward and Donald Brownlee. Rare Earth: Why Complex Life Is So Uncommon in the Universe. Copernicus, 2000.

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At Home With the Aliens

David Grinspoon. Lonely Planets: The Natural Philosophy of Alien Life. Harper Collins, 2003.

A Scientific Look at Aliens

Edward Regis, Jr. (Ed.) Extraterrestrials: Science and Alien Intelligence. Cambridge University Press, 1985.

Captured by Aliens

Joel Achenbach. Captured by Aliens: The Search for Life and Truth in a Very Large Universe. Simon and Schuster, 1999.

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Earth Calling...

Seth Shostak and Alex Barnett. Cosmic Company: The Search for Life in the Universe. Cambridge University Press, 2003.

Simon Conway Morris. Life's Solution: Inevitable Humans in a Lonely Universe. Cambridge University Press, 2003.