APA (7th ed.) Citation

Tolkien, J. R. R., & Tolkien, C. (1983). The monsters and the critics and other essays. Allen & Unwin.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Monsters and the Critics and Other Essays. London [etc.]: Allen & Unwin, 1983.

MLA (9th ed.) Citation

Tolkien, J. R. R., and Christopher Tolkien. The Monsters and the Critics and Other Essays. Allen & Unwin, 1983.