| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| March 1942 |
|
Astonishing Stories, March 1942 | Fictioneers, Inc. | MAGAZINE | 54 |
| May 1942 |
|
Astonishing Stories, May 1942 | Popular Publications, Inc.; Toronto, Canada | MAGAZINE | 61 |
| October 2005 |
|
Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein | Science Fiction Book Club | Collection | 395 |
| November 2010 |
|
Creating a Genre | The Virginia Edition | Collection | 53 |