| Date | Publication | Publisher | Type | Page | |
|---|---|---|---|---|---|
| January 1974 |
|
Science Fiction, Today and Tomorrow | Harper & Row | Nonfiction | 98 |
| 1975 |
|
Science Fiction, Today and Tomorrow | Penguin Books (US) | Nonfiction | 98 |
| October 1977 |
|
Le maschere del tempo | Fanucci Editore | Novel | 241 |
| November 1991 |
|
Le maschere del tempo | Fanucci Editore | Novel | 241 |