| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1967 |
|
The Key to Irunium / The Wandering Tellurian | Ace Books | Omnibus | 5|4 |
| August 1972 |
|
Die andere Dimension | Moewig | Novel | 5 |
| 1979 |
|
Irunium | Librairie des Champs-Élysées | Novel | |
| January 1985 |
|
Die andere Dimension | Pabel-Moewig | Novel | 3 |
| July 2012 |
|
The Key to Irunium | Gollancz | Novel | |
| July 2012 |
|
The Key to Irunium | Gateway / Orion | Novel |