First published in Natural History, April 1975.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| April 1981 |
|
Asimov on Science Fiction | Doubleday & Company | Nonfiction | 81 |
| July 1981 |
|
Asimov on Science Fiction | Doubleday / SFBC | Nonfiction | 75 |
| October 1981 |
|
Science Fiction Digest, October-November 1981 | Davis Publications | MAGAZINE | 7 |
| April 1982 |
|
Asimov on Science Fiction | Discus / Avon | Nonfiction | 61 |
| 1983 |
|
Asimov on Science Fiction | Granada | Nonfiction | 81 |