Story, R. D. (2002). The Mammoth encyclopedia of extraterrestrial encounters. Robinson.
Lua i Stíl Chicago (17ú heag.)Story, Ronald D. The Mammoth Encyclopedia of Extraterrestrial Encounters. London: Robinson, 2002.
Lua MLA (9ú heag.)Story, Ronald D. The Mammoth Encyclopedia of Extraterrestrial Encounters. Robinson, 2002.
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