by J. Allen Hynek
UFOs Merit Scientific Study, letter in "Science", 21 October 1966; republished verbatim in Symposium on Unidentified Flying Objects, U.S. House of Representatives, 27 July 1968. [USGPO]. Pgs. 12-13.
The UFO Experience: A Scientific Inquiry.
1972. [Re].
The Edge of Reality: A Progress Report on Unidentified Flying Objects.
1975. [Re].
With
Jacques Vallée.
Night Siege: The Hudson Valley UFO Sightings. 1987. [Bal].
With Philip J. Imbrogno and Bob Pratt.