In addition to books, he has edited a number of collections, such as The Oxford Book of Science Fiction Stories, and as of 2003 is the editor of the journal Studies in Medievalism.
Books
Old English Verse (London: Hutchinson's, 1972)
Poems of Wisdom and Learning in Old English (Cambridge: D.S. Brewer, Ltd., 1976; 2nd ed., 1977)
Beowulf. Arnold's Studies in English Literature series (London, 1978).
The Road to Middle-earth (London: Allen & Unwin, 1982; Boston: Houghton Mifflin, 1983), 2nd ed. (London: Harper Collins, 1993), also Revised and Expanded edition (Boston: Houghton Mifflin, 2003)