| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| 1958 |
|
The Void Beyond and Other Stories / The Blue Atom | Ace Books | Omnibus | 5|1 |
| February 1963 |
|
Urania #302 | Mondadori | MAGAZINE | 3 |
| September 1963 |
|
Das blaue Atom | Moewig | Novel | 1 |
| September 1973 |
|
Urania #628 | Mondadori | MAGAZINE | 3 |
| April 1979 |
|
10 chiavi per lo spazio | Mondadori | Anthology | 163 |
| September 1982 |
|
L'atomo azzurro | Mondadori | Novel |