Beagle, Peter S., "Tolkien's Magic Ring," in J. R. R. Tolkien, The Tolkien Reader, Ballantine Books, 1966, pp. ix-xv.
An excellent, if non-technical and short, introduction
to The Lord of the Rings by another celebrated writer
of fantasy.
Rosebury, Brian, Tolkien a Critical Assessment, St. Martin's Press, 1992.
An excellent extended study of Tolkien's style, and an
antidote to a lot of extremely bad criticism.
Shippey, T. A., The Road to Middle Earth, Harper.....
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