APA (7th ed.) Citation

Keen, M. (1973). England in the later Middle Ages: A political history. Methuen.

Chicago Style (17th ed.) Citation

Keen, Maurice. England in the Later Middle Ages: A Political History. London: Methuen, 1973.

MLA (9th ed.) Citation

Keen, Maurice. England in the Later Middle Ages: A Political History. Methuen, 1973.