APA (7th ed.) Citation

Ullmann, W. (1968). A history of political thought: The Middle Ages (Repr.). Penguin Books.

Chicago Style (17th ed.) Citation

Ullmann, Walter. A History of Political Thought: The Middle Ages. Repr. Harmondsworth: Penguin Books, 1968.

MLA (9th ed.) Citation

Ullmann, Walter. A History of Political Thought: The Middle Ages. Repr. Penguin Books, 1968.