| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1959 |
|
Astounding Science Fiction, March 1959 | Street & Smith Publications, Inc. | MAGAZINE | 44 |
| December 2007 | Instinct | Project Gutenberg | Chapbook | ||
| October 2009 |
|
Short Science Fiction Collection 28 | LibriVox | Anthology | |5 |