ebrary, Inc, Vakoch, D. A., & Harrison, A. A. (2011). Civilizations beyond earth: Extraterrestrial life and society. Berghahn Books.
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Dyfyniad Arddull Chicago
ebrary, Inc, Douglas A. Vakoch, and Albert A. Harrison. Civilizations Beyond Earth: Extraterrestrial Life and Society. New York: Berghahn Books, 2011.
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Dyfyniad MLA
ebrary, Inc, et al. Civilizations Beyond Earth: Extraterrestrial Life and Society. Berghahn Books, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.