D. J. O'Connor. Aquinas and Natural Law. London: Macmillan, 1967.
Books
The Just War in Aquinas and Grotius
Joan D. Tooke. The Just War in Aquinas and Grotius. London: S. P. C. K., 1965.
Aquinas by Frederick Copleston
Frederick C. Copleston. Aquinas. Harmondsworth, England: Penguin, 1965.
Toward Understanding Saint Thomas by Marie-Dominique Chenu
Marie-Dominique Chenu. Toward Understanding Saint Thomas. Translated by A. M. Landry and D. Hughes. Chicago: Regnery, 1964.
Guide to Thomas Aquinas
Josef Pieper. Guide to Thomas Aquinas. New York: Pantheon Books, 1962.
The Medieval Contribution to Political Thought
A. P. d'Entrèves. The Medieval Contribution to Political Thought: Thomas Aquinas, Marsilius of Padua, Richard Hooker. New York: Humanities Press, 1959.
The Life of Saint Thomas Aquinas: Biographical Documents
Kenelm Foster, ed. The Life of Saint Thomas Aquinas: Biographical Documents. London: Longmans, Green, 1959.
The System of Thomas Aquinas
Maurice de Wulf. The System of Thomas Aquinas. New York: Dover, 1959.
St. Thomas Aquinas
Jacques Maritain. St. Thomas Aquinas. Translated by Joseph W. Evans and Peter O'Reilly. New York: Meridian Books, 1958.
Principality and Polity: Aquinas and the Rise of State Theory in the West
Thomas Gilby. Principality and Polity: Aquinas and the Rise of State Theory in the West. London: Longmans, Green, 1958.