APA (7th ed.) Citation

Southern, R. W. (1970). Western society and the Church in the Middle Ages. Penguin Books.

Chicago Style (17th ed.) Citation

Southern, R. W. Western Society and the Church in the Middle Ages. Harmondsworth, Eng.: Penguin Books, 1970.

MLA (9th ed.) Citation

Southern, R. W. Western Society and the Church in the Middle Ages. Penguin Books, 1970.