APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1988). Unfinished tales of Númenor and Middle-earth (1st Ballantine Books ed.). Ballantine Books.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Númenor and Middle-earth. 1st Ballantine Books ed. New York: Ballantine Books, 1988.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Númenor and Middle-earth. 1st Ballantine Books ed. Ballantine Books, 1988.