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Catechism of the Catholic Church. Liguori, Missouri: Liguori Publications, 1994.

Anselm. Basic Writings: Proslogium, Monologium, Cur Deus Homo. Trans. S.N. Deane. La Salle, IL: Open Court Publishing Company, 1962.

Aquinas, St. Thomas. Summa Theologica. Read it online!

Aquinas, St. Thomas. Introduction to St. Thomas Aquinas: The Summa Theologica and the Summa Contra Gentiles. Ed. Anton C. Pegis. New York: McGraw-Hill, 1948.

Aquinas, St. Thomas. Nature and Grace: Selections from the Summa Theologica. Trans. Ed. A.M. Fairweather. Philadelphia: Westminster Press, 1954.

Aquinas, St. Thomas. Treatise on Happiness: Selections from the Summa Theologica. Trans. John A. Oesterle. Notre Dame, Indiana: U of Notre Dame P, 1983.

Aristotle. Metaphysics. Trans. Hippocrates G. Apostle. Grinnell, Iowa: Peripatetic Press, 1979.

Aristotle. Nicomachean Ethics. Trans. Hippocrates G. Apostle. Grinnell, Iowa: Peripatetic Press, 1984.

St. Augustine of Hippo. Confessions. Trans. Henry Chadwick. Oxford: Oxford UP, 1992.

Drummey, James J. Catholic Replies. Norwood, Mass.: CR Publications, 1995.

May, William E. Marriage: The Rock on Which the Family is Built. San Francisco: Ignatius Press, 1995.

McInerny, Ralph. Aquinas On Human Action: A Theory of Practice. Washington, D.C.: Catholic University of America Press, 1992.

McInerny, Ralph. Ethica Thomistica: The Moral Philosophy of Thomas Aquinas. Washington, D.C.: Catholic University of America Press, 1982. Read it online!

McInerny, Ralph. What Makes Actions Good or Bad? Read it online!

Smith, Janet E. Humanae Vitae: A Generation Later. Washington, D.C.: Catholic University of America Press, 1991.