APA (7th ed.) Zitazioa

Ker, W. (1969). Medieval English literature. O.U.P..

Chicago Style (17th ed.) Zitazioa

Ker, W.P. Medieval English Literature. Oxford: O.U.P., 1969.

MLA (9th ed.) Zitazioa

Ker, W.P. Medieval English Literature. O.U.P., 1969.