APA (7th ed.) Citation

Sisam, K. (1965). The Structure of Beowulf. Clarendon Press.

Chicago Style (17th ed.) Citation

Sisam, Kenneth. The Structure of Beowulf. Oxford: Clarendon Press, 1965.

MLA (9th ed.) Citation

Sisam, Kenneth. The Structure of Beowulf. Clarendon Press, 1965.