APA (7th ed.) Citation

Ker, W. P. (1969). Medieval English literature / by W.P. Ker ([New ed.].). O.U.P..

Chicago Style (17th ed.) Citation

Ker, W. P. Medieval English Literature / by W.P. Ker. [New ed.]. O.U.P., 1969.

MLA (9th ed.) Citation

Ker, W. P. Medieval English Literature / by W.P. Ker. [New ed.]. O.U.P., 1969.

Warning: These citations may not always be 100% accurate.