* The Robot War (1969)
* Starforce: Book 1 of The Faded Sun Trilogy (1980)
* The Lost Legion (1990)
* The Siege of Earth (1993)
* Anvil of Stars (1995)
* Crucible of Light (1997)
* The Burning (1998)
* The Crucible (2001)
* Beyond the Stars (2003)
* Inherit the Stars (2005)
* The Star Conquerors (2007)
* The Galaxy Unleashed (2009)
* The Great War (2011)
* The Final Victory (2013)
Short Stories:
* "And Death Shall Come" (1969)
* "The Survivors" (1969)
* "The Children of the Lens" (1970)
* "The Day the Sky Changed" (1970)
* "The Last Starship" (1971)
* "The Time Traveler" (1971)
* "The Death Ship" (1972)
* "The Mind War" (1972)
* "The Alien Artifact" (1973)
* "The Crystal Warriors" (1973)
* "The Galactic Menace" (1974)
* "The Robot Rebellion" (1974)
* "The Time Trap" (1975)
* "The Cosmic Crucible" (1975)
* "The End of the World" (1976)
Collections:
* The Last Starship and Other Stories (1976)
* The Robot Rebellion and Other Stories (1977)
* The Cosmic Crucible and Other Stories (1978)
* The End of the World and Other Stories (1979)