Jones, H. Spencer, author
Life on other worlds
Macmillan, 1956
 Buku Teks
Achenbach, Joel, author
Captured by aliens: the search for life and truth in a very large universe
Simon & Schuster, 1999
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Lewis, John S., author
Worlds without end : the exploration of planets known and unknown
Helix Books, 1998
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Clancy, Paul, author
Looking for life, searching the solar system
Cambridge University Press, 2005
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Lewis, C.S., author
Out of the silent planet
Macmillan, 1947
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