| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| The Edge of Reality: A Progress Report on Unidentified Flying Objects | 978-0-8092-8150-3 (0-8092-8150-3) | 1976 | |
| The Ufo Experience: A Scientific Inquiry | 978-1-56924-782-2 (1-56924-782-X) | 1998 | Allen J. Hynek |
| The UFO Experience: A Scientific Inquiry | 978-0-8094-8054-8 (0-8094-8054-9) | 1989 | |
A. H. · Allen H. · J. A. · J. Allen · J. Allen Hynek · J. H. · J. Hynek · Joseph A. · Joseph Allen · Joseph H.
Da Capo Lifelong Books · McGraw-Hill · Time Life Education