- (1995) Book: "The Ape-Man Within". Prometheus Books, ISBN 0879759518
- (1992) Novel: "The Enchanter Reborn". Baen Books,
- (1998) Novel (with Harry Turtledove): "Fox and Empire". Baen Books, ISBN 0671878581
- (1995) Novel: (with Christopher Stasheff) "The Exotic Enchanter". Baen Books, ISBN 067187666X
- (1996) Novel: "The Reluctant King". Baen Books, ISBN 0671877461
- (1975) Biography: "H.P. Lovecraft: A Biography"
- Novel: "Lest Darkness Fall"
- (April 1938) Short Story: "Hyperpilosity" in "Astounding Science-Fiction" Magazine. New York City: Street & Smith Publications, Inc.
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