APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1993). The return of the shadow: The history of The lord of the rings, part one. HarperCollins.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Return of the Shadow: The History of The Lord of the Rings, Part One. London: HarperCollins, 1993.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Return of the Shadow: The History of The Lord of the Rings, Part One. HarperCollins, 1993.