| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| November 1959 |
|
Amazing Science Fiction Stories, November 1959 | Ziff-Davis Publishing Company | MAGAZINE | 15 |
| January 2010 | The Observers | Project Gutenberg | Chapbook | ||
| May 2013 |
|
Four Science Fiction Stories | LibriVox | Collection | |4 |