Publications (7)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| February 1963 | Amazing Stories, February 1963 | Ziff-Davis Publishing Company | MAGAZINE | 8 |
| 1968 | Project Barrier | Gollancz | Collection | |
| 1970 | Project Barrier | Sphere Books | Collection | 23 |
| December 1974 | Thrilling Science Fiction, December 1974 | Ultimate Publishing Co., Inc. | MAGAZINE | 4 |
| 1979 | Project Barrier | Hamlyn Paperbacks | Collection | 23 |
| April 2016 | Project Barrier | Phoenix Pick | Collection | |
| May 2016 | Project Barrier | Phoenix Pick | Collection |