APA (7th ed.) Citation

Rateliff, J. D., & Tolkien, J. R. R. (2007). The history of the Hobbit. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Rateliff, John D., and J. R. R. Tolkien. The History of the Hobbit. Boston: Houghton Mifflin, 2007.

MLA (9th ed.) Citation

Rateliff, John D., and J. R. R. Tolkien. The History of the Hobbit. Houghton Mifflin, 2007.