↑ Sheaffer, Robert. (1981). The UFO Verdict: Examining the Evidence. Prometheus Books. p. 20. ISBN978-0879751463 "APRO and the National Enquirer had arranged an earlier secret polygraph test for Travis with John J. McCarthy, the most experienced polygraph examiner in the state of Arizona. McCarthy found Travis to be attempting "gross deception," and pronounced the abduction story a hoax."
↑ Baker, Robert Allen. (1992). Hidden Memories: Voices and Visions from Within. Prometheus Books. p. 319. ISBN978-1-57392-094-0 "With regard to the Travis Walton affair, this was one of the more tawdry examples of "true-believer" chicanery, sensationalizing on the part of the media, and greedy men who tried to pull off a hoax that failed."
↑ Hutchinson, Mike; Hoggart, Simon. (2000). Bizarre Beliefs. Richard Cohen Books. p. 39. ISBN978-1860660214 "To put it bluntly, there is nothing in the Travis Walton story to suggest anything more than a hoax."
↑ Nickell, Joe. (1992). Missing Pieces: How to Investigate Ghosts, UFOs, Psychics, & Other Mysteries. Prometheus Books. p. 202. ISBN0-87975-729-9 "A more rigorous investigation by Philip J. Klass (1989) discovered that the case was a hoax, that the lie detector test was flawed, and the abduction a "put- up job" to make money."
