APA-Zitierstil (7. Ausg.)

Ullmann, W. (1965). A history of political thought: The Middle Ages. Penguin Books.

Chicago-Zitierstil (17. Ausg.)

Ullmann, Walter. A History of Political Thought: The Middle Ages. Harmondsworth [u.a.]: Penguin Books, 1965.

MLA-Zitierstil (9. Ausg.)

Ullmann, Walter. A History of Political Thought: The Middle Ages. Penguin Books, 1965.