APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1991). Unfinished tales of Nʹumenor and Middle-earth. Grafton.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Nʹumenor and Middle-earth. London: Grafton, 1991.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Nʹumenor and Middle-earth. Grafton, 1991.