APA (7th ed.) Citation

Ullman, W. (1961). Principles of Goverment and Politics in the Middle Ages. Methuen & Co Ltd.

Chicago Style (17th ed.) Citation

Ullman, Walter. Principles of Goverment and Politics in the Middle Ages. London: Methuen & Co Ltd, 1961.

MLA (9th ed.) Citation

Ullman, Walter. Principles of Goverment and Politics in the Middle Ages. Methuen & Co Ltd, 1961.

Warning: These citations may not always be 100% accurate.