Excerpt from "Isaac Asimov Explains" (Force Fields)
| First published | June 1969 |
|---|---|
| Type | Essay |
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| June 1969 |
|
Opus 100 | Houghton Mifflin | Collection | 276 |
| October 1970 |
|
Opus 100 | Dell | Collection | 251 |
| October 1970 |
|
Opus 100 | Dell | Collection | 251 |
| 1980 |
|
Opus: A Selection from the First 200 Books | Andre Deutsch | Omnibus | |251 |
| December 1980 |
|
Opus 100 | Dell | Collection |