APA (7th ed.) Citation

Tolkien, J. R. R., & Sisam, K. (1922). A middle English vocabulary. The Clarendon Press.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., and Kenneth Sisam. A Middle English Vocabulary. Oxford: The Clarendon Press, 1922.

MLA (9th ed.) Citation

Tolkien, J. R. R., and Kenneth Sisam. A Middle English Vocabulary. The Clarendon Press, 1922.