Sources
- Jerome Clark; The UFO Book: Encyclopedia of the Extraterrestrial; Visible Ink, 1998; ISBN 1-57859-029-9
- Richard M. Dolan, UFOs and the National Security State: Chronology of a Cover-up 1941–1973, 2002, ISBN 1-57174-317-0 (pp. 19–98, passim)
- David Michael Jacobs; The UFO Controversy In America; Indiana University Press, 1975; ISBN 0-253-19006-1
- Edward J. Ruppelt, The Report on Unidentified Flying Objects
- 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)
Read more about this topic: Project Grudge
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