Publications (4)
| Date | Publication | Publisher | Type | Page |
|---|---|---|---|---|
| November 1966 | SFWA Bulletin, November 1966 | The Science Fiction Writers of America | MAGAZINE | 3 |
| 1976 | The SFWA Handbook | The Science Fiction Writers of America | Nonfiction | 55 |
| February 1977 | Turning Points: Essays on the Art of Science Fiction | Harper & Row | Nonfiction | 205 |
| May 2014 | Turning Points: Essays on the Art of Science Fiction | Gateway / Orion | Nonfiction |