APA (7th ed.) Citation

Ullmann, W. (1970). A history of political thought the Middle Ages (Reprinted with revisions.). Penguin Books.

Chicago Style (17th ed.) Citation

Ullmann, Walter. A History of Political Thought the Middle Ages. Reprinted with revisions. Harmondsworth [etc.]: Penguin Books, 1970.

MLA (9th ed.) Citation

Ullmann, Walter. A History of Political Thought the Middle Ages. Reprinted with revisions. Penguin Books, 1970.