Ullmann, W. (1966). Principles of government and politics in the Middle Ages (2 ed.). Methuen.
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Citação norma Chicago
Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2 ed. London: Methuen, 1966.
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Citação norma MLA
Ullmann, Walter. Principles of Government and Politics in the Middle Ages. 2 ed. Methuen, 1966.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.