| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1973 |
|
The Best of Isaac Asimov | Sphere | Collection | 332 |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1973 |
|
The Best of Isaac Asimov | Sphere | Collection | 332 |