| Source | Date | Type | Role |
|---|---|---|---|
| Foundations of Science Fiction: A Study in Imagination and Evolution | 1987-04 | Book | Author |
| Great Themes of Science Fiction: A Study in Imagination and Evolution | 1987-10 | Book | Author |
| When World Views Collide: A Study in Imagination and Evolution | 1989 | Book | Author |
| Odd Genre: A Study in Imagination and Evolution | 1994 | Book | Author |