| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| November 1967 |
|
The Secret in the Sky | Bantam Books | Novel | |
| November 1967 |
|
The Secret in the Sky | Bantam Books | Novel | |
| October 1968 |
|
The Secret in the Sky | Bantam Books | Novel | |
| August 1969 |
|
The Secret in the Sky | Bantam Books | Novel | |
| 1970 |
|
Alerte dans le ciel | Marabout | Novel | |
| August 1973 |
|
Feuerzeichen am Himmel | Pabel | Novel | |
| August 1977 |
|
The Secret in the Sky | Bantam Books | Novel |