Cita APA (7a ed.)

Ullmann, W. (1966). Principles of government and politics in the Middle Ages (2nd ed.). Methuen & Co.

Cita Chicago Style (17a ed.)

Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2nd ed. London: Methuen & Co, 1966.

Cita MLA (9a ed.)

Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2nd ed. Methuen & Co, 1966.