Ernest Fortin. "St. Thomas Aquinas." In History of Political Philosophy, 248-75. Edited by Leo Strauss and Joseph Cropsey. 3rd ed. Chicago: University of Chicago Press, 1987.
Commentary
“Thomistic Natural Right”
E. A. Goerner. "Thomistic Natural Right." Political Theory 11, no. 3 (1983): 393-418.
Thomas Aquinas and Radical Aristotelianism
Fernand van Steenberghen. Thomas Aquinas and Radical Aristotelianism. Washington, D.C.: Catholic University of America Press, 1980.
Aquinas
Anthony Kenny. Aquinas. Oxford: Oxford University Press, 1980.
“Augustine, Thomas Aquinas, and the Problem of the Natural Law”
Ernest Fortin. "Augustine, Thomas Aquinas, and the Problem of Natural Law." Mediaevalia 4 (1978): 179-208.
Index Thomisticus
Roberto Busa. Index Thomisticus. Stuttgart: Frommann-Holzboog, 1974-.
Aquinas and Natural Law
D. J. O'Connor. Aquinas and Natural Law. London: Macmillan, 1967.
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.