- 1954 The Other Side of the Green
- 1959 Walking into Tomorrow: Twelve Men Who Made New Discoveries
- 1967 Close-up on Crime
- 1973 Missourian in Space
- 1974 America's First Woman Cosmonaut
- 1978 In Pursuit of Justice
Short fiction (selected)
- "Two Brothers", The Magazine of Fantasy and Science Fiction (Feb. 1959)
- "An Old Woman on a Couch", Fantastic (summer 1961)
- "Man Outside", in Dangerous Visions (1967) by Harlan Ellison (editor)
- "The Little Green Men Invade!", Amazing Stories (Jan. 1968)
- "I'm Scared", If (winter 1974)
Short story collections
- 1983 Walk Through Tomorrow
Anthologies (Selected)
- 1982 Nebula Winners #16
Nonfiction works for younger readers. (Selected)
- 1961 Space for Hire: The Story of a Small Businessman and Big Rockets
- 1966 All About the Human Mind
- 1983 Science Fiction: A Guide for the Perplexed
- 1965 Looking Down from Space
- 1966 All Over but the Shooting: Ten True Crime Case Histories
- 1967 Journey Into a Black Hole
Movie Novels (novelizations)
-1979 "Star Trek; The Motion Picture"
-1991 (with wife Rebecca): "Star Trek 5; The Final Frontier."