Ullmann, W. (1978). Principles of government and politics in the Middle Ages. Methuen.
Style de citation Chicago (17e éd.)Ullmann, Walter. Principles of Government and Politics in the Middle Ages. Methuen, 1978.
Style de citation MLA (9e éd.)Ullmann, Walter. Principles of Government and Politics in the Middle Ages. Methuen, 1978.
Attention : ces citations peuvent ne pas être correctes à 100%.