Jerome Clark, The UFO Book: Encyclopedia of the Extraterrestrial; Visible Ink Press, 1998
Edward J. Ruppelt, The Report on Unidentified Flying Objects
Ann Druffel, Firestorm — Dr. James E. McDonald's Fight For UFO Science, Wild Flower Press, Columbus, 1997, ISBN0-926524-58-5 (passim, especially pp. 450–474)
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)
H. W. Wilson, Current Biography, 1956, February 1989
Curtis Peebles, Watch the Skies: A Chronicle of the Flying Saucer Myth; New York: Berkley Books, 1995.
