- (book) 'Fiction 2000: Cyberpunk and the Future of Narrative'. (2000) (anthology) (co-author with George Slusser)
- (book) 'The Hammer and the Cross'. (1993) (co-author as John Holm with Harry Harrison)
- (book) 'Fictional Space: Essays on Contemporary Science Fiction'. (1991) (editor)
- (book) 'J.R.R. Tolkien: Author of the Century'. (2001) (author)
- The Road to Middle-earth. London: Allen & Unwin, 1982; Boston: Houghton Mifflin, 1983. 2nd enlarged edition: London: Harper Collins, 1993.
- Poems of Wisdom and Learning in Old English. Cambridge: D.S. Brewer, Ltd., 1976.
- Beowulf. Arnold's Studies in English Literature series (London, 1978).
- J. R. R. Tolkien: Author of the Century. London: Harper Collins, 2000.
- Old English Verse. London: Hutchinson's, 1972.
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