APA način citiranja (7. izdanje)

Ullmann, W. (1965). A history of political thought: The middle ages. Penguin.

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (9. izdanje)

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