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Anthologies
- Book of the Werewolf (1973)
- Dracula's Brethren (2017) with Richard Dalby
- The Monster with a Thousand Faces: Guises of the Vampire in Myth and Literature (1989)
- The Essential Guide to Werewolf Literature (2003)
- A. Merritt: Lord of Fantasy (1971)
- Virgil Finlay: A Profile (1972)
- Introduction: Images of the Werewolf (Book of the Werewolf) (1973)
- The Werewolf Theme in Weird Fiction (1973)
- Her Ways Are Death (1981)
- Beyond the Threshold (Part 1 of 2) (1984)
- Beyond the Threshold (Part 2 of 2) (1985)
- Introduction (Dracula's Brethren) (2017)