Project Sign

Project Sign (pol.: Projekt Znak) to oficjalny program rządu USA zajmujący się zjawiskiem UFO przedsięwzięty przez Siły Powietrzne Stanów Zjednoczonych. Rozpoczął się pod koniec 1947 roku i został zastąpiony pod koniec 1948 roku przez projekt Uraza.

Bibliografia

  • Edward J. Ruppelt, Raport w sprawie UFO, Nolpress, 1992 Wersja WWW po angielsku
  • Jerome Clark, The UFO Book: Encyclopedia of the Extraterrestrial, Visible Ink, 1998; ISBN 1-57859-029-9
  • David Michael Jacobs, The UFO Controversy In America, Indiana University Press, 1975; ISBN 0-253-19006-1
  • Curtis Peoples, Watch the Skies! – A Chronicle of the Flying Saucer Myth. Smithsonian, 1994, ISBN 1-56098-343-4.
  • Michael D. Swords, "UFOs, the Military, and the Early Cold War" (pp. 82-122 in UFOs and Abductions: Challenging the Borders of Knowledge, David M. Jacobs, editor; University Press of Kansas, 2000; ISBN)

Linki zewnętrzne

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