Martin Gardner. The New Age; Notes of a Fringe Watcher. Prometheus Books, 1988.
Steuart Campbell. The UFO Mystery Solved, Explicit Books, 1994. 🔻
James Oberg. UFOs and Outer Space Mysteries: A Sympathetic Sceptics Report. 1983.
Philip J. Klass. UFOs; The Public Deceived. Prometheus Books, 1983.
Donald Menzel and Ernest H. Taves. The UFO Enigma; The Definitive Explanation of the UFO Phenomenon. Doubleday, 1977.
David Clarke and Andy Roberts. Phantoms of the Sky. Hale, 1990.
Robert Sheaffer. The UFO Verdict. Prometheus Books, Buffalo, 1981.
