- Understanding Contemporary American Science Fiction: The Formative Period, (1926-1970)
- Science Fiction in America, 1870s-1930s: An Annotated Bibliography of Primary Sources (Bibliographies and Indexes in American Literature)
- Robert Silverberg (Starmont Reader's Guide ; 18)
- Science Fiction Criticism: An Annotated Checklist (The Serif Series: Bibliographies & Checklists)
- Many Futures, Many Worlds: Theme and Form in Science Fiction