APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1991). The treason of Isengard: The history of the Lord of the rings, part two. HarperCollins.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Treason of Isengard: The History of the Lord of the Rings, Part Two. London: HarperCollins, 1991.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Treason of Isengard: The History of the Lord of the Rings, Part Two. HarperCollins, 1991.