First appeared in The SFWA Bulletin #10.
| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| January 1967 |
|
SFWA Bulletin, January 1967 | The Science Fiction Writers of America | MAGAZINE | 12 |
| 1968 |
|
Convention Annual No. 4: Tricon Edition | Jay Kay Klein | Nonfiction | 3 |
| February 1977 |
|
Turning Points: Essays on the Art of Science Fiction | Harper & Row | Nonfiction | 273 |
| August 1979 |
|
The Bulletin of the Science Fiction Writers of America, Fall 1979 | The Science Fiction Writers of America | MAGAZINE | 31 |
| April 1981 |
|
Asimov on Science Fiction | Doubleday & Company | Nonfiction | 313 |
| July 1981 |
|
Asimov on Science Fiction | Doubleday / SFBC | Nonfiction | 297 |
| April 1982 |
|
Asimov on Science Fiction | Discus / Avon | Nonfiction | 281 |
| 1983 |
|
Asimov on Science Fiction | Granada | Nonfiction | 313 |
| April 1984 |
|
Guida alla fantascienza | Mondadori | Nonfiction | 231 |
| May 2014 |
|
Turning Points: Essays on the Art of Science Fiction | Gateway / Orion | Nonfiction |