Tohutoro APA (7th ed.)
Ullmann, W. (1966). Principles of government and politics in the Middle Ages (2 ed.). Methuen.
Tohutoru Kātū Chicago (17th ed.)
Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2 ed. London: Methuen, 1966.
Tohutoro MLA (9th ed.)
Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2 ed. Methuen, 1966.
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