Đọc thêm Nghịch lý Fermi

Ben Zuckerman and Michael H. Hart, Extraterrestrials: Where Are They? ISBN 0-521-44803-4 Amazon
Savage, Marshall T. (1992). The Millennial Project: Colonizing the Galaxy in 8 Easy Steps. Denver: Empyrean Publishing. ISBN 0-9633914-8-8.
Webb, Stephen (2002). If the Universe Is Teeming with Aliens... Where Is Everybody?. Copernicus Books. ISBN 0-387-95501-1.
Michaud, Michael (2006). Contact with Alien Civilizations: Our Hopes and Fears about Encountering Extraterrestrials. Copernicus Books. ISBN 978-0387-28598-6.
Gold, Thomas (1998). The Deep Hot Biosphere. Springer. ISBN 978-0387952536.
Evolving the Alien: The Science of Extraterrestrial Life

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