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3. Aquinas, Thomas. On Kingship. Translated by Gerald Pherald. U.S.A.: Hyperion Press, 1979.
4. Aquinas, Thomas. Summa Contra Gentiles. Translated by Vernon Bourke. New York: Image Books, 1956.
5. Aquinas, Thomas. Summa Theologica. Translated by Fathers of the English Dominican Province. New York: Benziger Bros, 1947.