* The Singing Thing (1967)
* Royal Blood (1968)
* Eye Level (1969)
* The Boy with Two Shadows (1971)
* Green Star (1972)
* Earth-Shaker (1973)
* The Castle (1975)
* Moonbreaker (1977)
* Spacecraft 2000 (1979)
* The Time-Twister (1981)
* The Space-Born (1983)
* The Time-Born (1984)
* Mind-Blast (1986)
* Mind-Spin (1988)
* Brain-Box (1990)
* Code-Cracker (1992)
* Data-Thief (1995)
* Ghost-Writer (1997)
* Soul-Snatcher (1999)
* The Shadow-Maker (2002)
Short Stories
* "The End of Everything" (1963)
* "The Day the Wind Stopped" (1964)
* "The Man Who Could See the Future" (1965)
* "The Man Who Could Not Die" (1966)
* "The Man Who Could Fly" (1967)
* "The Man Who Could Change Shape" (1968)
* "The Man Who Could Read Minds" (1969)
* "The Man Who Could Control the Weather" (1970)
* "The Man Who Could Create Life" (1971)
* "The Man Who Could Destroy the World" (1972)
Non-Fiction
* The Science of Science Fiction (1968)
* The History of Science Fiction (1976)
* The Future of Science Fiction (1982)
* The World of Science Fiction (1986)
* The Encyclopedia of Science Fiction (1993)