| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1968 |
|
The Age of Ruin / Code Duello | Ace Books | Omnibus | 5|4 |
| February 1973 |
|
Computer War / Code Duello | Ace Books | Omnibus | 5 |
| September 2011 |
|
Code Duello | Gateway / Orion | Novel | |
| August 2017 |
|
Code Duello | Wildside Press | Novel | |
| September 2017 |
|
Code Duello | Wildside Press | Novel |