ゴーマンUFO空中戦
Condon, Edward Uhler (1969). Final Report of the Scientific Study of Unidentified Flying Objects. Dutton. p. 505
Clark, Jerome (1998). The UFO Encyclopedia: The Phenomenon from the Beginning. Detroit: Omnigraphics. pp. 452–453. ISBN 0-7808-0097-4
Peebles, Curtis (1995). Watch the Skies: A Chronicle of the Flying Saucer Myth. New York: Berkley Books. pp. 29–31. ISBN 0-425-15117-4
Ruppelt, Edward J. (1956). The Report on Unidentified Flying Objects. Garden City, New York: Doubleday & Company. pp. 30–31. http://www.gutenberg.org/etext/17346