Secrets of Middle-Earth: Inside Tolkien's The Return of the King

Secrets of Middle-Earth: Inside Tolkien's The Hobbit

Secrets of Middle-Earth: Inside Tolkien's The Fellowship of the Ring

Secrets of Middle-Earth: Inside Tolkien's The Two Towers

J.R.R. Tolkien: Master of the Rings - The Definitive Guide to the World of the Rings

J.R.R.T. : A Study of John Ronald Reuel Tolkien, 1892-1973

Tolkien in Oxford