- Natural Law and Natural Rights (Clarendon Law Series)
- Moral Absolutes: Tradition, Revision, and Truth (The Michael J. Mcgivney Lectures of the John Paul II Institute for Studies on Marriage and Family ;)
- Fundamentals of Ethics
- Nuclear Deterrence, Morality, and Realism
- Aquinas: Moral, Political, and Legal Theory (Founders of Modern Political and Social Thought)