J.R.R. Tolkien: A Biography
The Tolkien Reader
The Road to Middle-Earth: How J.R.R. Tolkien Created a New Mythology
The Monsters and the Critics: And Other Essays. J.R.R. Tolkien
Unfinished Tales of Númenor and Middle-earth
Morgoth's Ring (History of Middle-Earth, Vol. 10)
The Complete Tolkien Companion
Tree and Leaf: Including Mythopoeia
The Philosophy of Tolkien: The Worldview Behind the Lord of the Rings
The War of the Jewels (The History of Middle-earth) (V.2 1)