APA (7th ed.) Citation

Ker, W. P. (1969). Medieval English literature ([1st ed.). Oxford U.P..

Chicago Style (17th ed.) Citation

Ker, W. P. Medieval English Literature. [1st ed. London, New York: Oxford U.P., 1969.

MLA (8th ed.) Citation

Ker, W. P. Medieval English Literature. [1st ed. Oxford U.P., 1969.