APA (7th ed.) Citation

Tolkien, J. R. R., Tolkien, C., & Nasmith, T. (2004). The Silmarillion. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., Christopher Tolkien, and Ted Nasmith. The Silmarillion. Boston: Houghton Mifflin, 2004.

MLA (9th ed.) Citation

Tolkien, J. R. R., et al. The Silmarillion. Houghton Mifflin, 2004.