Communication with extraterrestrial intelegence
edited by J. Billingham and
Pergamon Press, 1979
 Buku Teks
Halley, J. Woods, author
How likely is extraterrestrial life?
[Springer, ], 2012
 eBooks
Dick, Steven J., author
The biological universe: the twentieth-century extraterrestrial life debate and the limits of science
Cambridge University Press, 1996
 Buku Teks
Life on earth
by Edwad O. Wilson ... [et.al.]
Sinauer Associates, 1973
 Buku Teks
Achenbach, Joel, author
Captured by aliens: the search for life and truth in a very large universe
Simon & Schuster, 1999
 Buku Teks
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