| "UFOs: Testing for the Existence of Air Force Censorship | The UFO Verdict: Examining the Evidence, 1986, ISBN 0-87975-338-2• " Metuchen: Scarecrow Press, 1979 |
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| Leicester, UK: Midland Publishing, 2006 | "The quantum inequalities do not forbid spacetime shortcuts" |
| ,A Nonreactive, Quantitative Study of Mass Behavior with Emphasis on the Cinema as Behavior Catalyst," Psychological Reports, 1981, 48, 775-785 | Many classic cases and UFO history provided in great detail; highly documented |
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| Hull ; 1979, Princeton University Press, ISBN 0-691-01822-7• "UFO Phenomena and the Behavioral Scientist | , UFO FBI Connection, 2000, Llewellyn Publications, ISBN 1-56718-493-6• A UFO classic by insider Ruppelt, the first head of the USAF• Skeptical but balanced analysis of 1300 UFO cases |
America, including the so-called "contactee cults.
| UFO Sightings: The Evidence, 1998, Prometheus Books, ISBN 1-57392-213-7 revised edition of The UFO Verdict• , UFOs and the National Security State: An Unclassified History, Volume One: 1941-1973, 2000, Keyhole Publishing, ISBN 0-9666885-0-3 | The UFO Evidence: A Thirty-Year Report |
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| " Psychology, 1976, 13, 3-5 | , a type of mirage in which objects located below the astronomical appear to be hovering in the sky, may be responsible for some UFO sightings |