APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1980). Unfinished tales of Númenor and Middle-earth. Allen & Unwin.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Númenor and Middle-earth. London ; Boston: Allen & Unwin, 1980.

MLA (8th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. Unfinished Tales of Númenor and Middle-earth. Allen & Unwin, 1980.