| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1955 |
|
This Fortress World | Gnome Press | Novel | |
| 1957 |
|
The 13th Immortal / This Fortress World | Ace Books | Omnibus | 5 |
| November 1957 |
|
Von Mauern umgeben... | Pabel | Novel | 3 |
| June 1966 |
|
Proxima #3 | Granillo Editore | MAGAZINE | 5 |
| 1973 |
|
Das Vermächtnis der Terraner | Bastei Lübbe | Novel | |
| December 1976 |
|
Questo mondo inespugnabile | Libra Editrice | Novel | 5 |
| February 1977 |
|
This Fortress World | Sphere Books | Novel | 5 |
| May 1977 |
|
Le monde forteresse / Futur imparfait / Les hommes du dehors | OPTA | Omnibus | 1 |
| 1978 |
|
Vestingwereld | Gradivus | Novel | |
| April 1979 |
|
This Fortress World | Berkley Books | Novel | 1 |
| May 2009 |
|
This Fortress World | Fantastic Books | Novel | |
| February 2010 |
|
This Fortress World | Audible Frontiers | Novel | |
| June 2012 |
|
This Fortress World | Gateway / Orion | Novel | |
| April 2014 |
|
This Fortress World | Open Road Integrated Media | Novel | |
| July 2016 |
|
This Fortress World | Audible Studios on Brilliance Audio | Novel | |
| June 2020 |
|
This Fortress World | ReAnimus Press | Novel | |
| June 2020 |
|
This Fortress World | ReAnimus Press | Novel |