Asimov, I., 1979, Extraterrestrial Civilizations: New York, Crown.
Hendry, A., 1979, The UFO Handbook: A Guide to Investigating, Evaluating and Reporting UFO Sightings: Garden City, New York, Doubleday & Co., 297 p.
Hoyle, F., 1983, The Intelligent Universe: London, Michael Joseph, 256 p.
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