APA (7th ed.) Citation

Tolkien, J. R. R., Gordon, E. V., & Davis, N. (1967). Sir Gawain and the Green Knight (2nd ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R., E. V. Gordon, and Norman Davis. Sir Gawain and the Green Knight. 2nd ed. Oxford: Clarendon Press, 1967.

MLA (8th ed.) Citation

Tolkien, J. R. R., et al. Sir Gawain and the Green Knight. 2nd ed. Clarendon Press, 1967.