Tham khảo Estimate_of_the

Tham khảo Estimate_of_the_Situation

Michael D. Swords, Project Sign and the Estimate of the Situation in Journal of UFO Studies, 2000 Đọc trực tuyến
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
Diana Palmer Hoyt, Ufocritique: UFO's, Social Intelligence and the Condon Committee, Master's Thesis, Virginia Polytechnic Institute, 2000 Đọc trực tuyến
J. Allen Hynek, The UFO Experience: A Scientific Inquiry, McGraw-Hill Contemporary, 1972 ISBN 978-0809291304
Kevin D. Randle, UFO Casebook, Warner Books, 1989 ISBN 0-446-35715-4
Jenny Randles, Peter Houghe, The Complete Book of UFOs: An Investigation into Alien Contact and Encounters, Sterling Publishing Co, 1994, ISBN 0-8069-8132-6
Edward J. Ruppelt, The Report on Unidentified Flying Objects, 1956, Doubleday & Company Đọc trực tuyến Chương 2 Lưu trữ 2005-09-20 tại Wayback Machine
Michael D. Swords, UFOs, the Military, and the Early Cold War in UFOs and Abductions: Challenging the Borders of Knowledge Bản mẫu:Pp., David M. Jacobs editeur, University Press of Kansas, 2000

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