APA (7th ed.) Citation

Tyler, J. E. A., & Tolkien, J. R. R. (1977). The Tolkien companion. Avon.

Chicago Style (17th ed.) Citation

Tyler, J. E. A., and J. R. R. Tolkien. The Tolkien Companion. New York: Avon, 1977.

MLA (9th ed.) Citation

Tyler, J. E. A., and J. R. R. Tolkien. The Tolkien Companion. Avon, 1977.