1976
The Social and Ethical Thought of C.S. Lewis (N.J. Princeton University.).
1978
The Taste for the Other : The Social and Ethical Thought of C.S. Lewis (Eerdmans).
1981
Friendship, a Study in Theological Ethics (University of Notre Dame Press).
1984
The Theory and Practice of Virtue (University of Notre Dame Press).
1987
The Limits of Love : Some Theological Explorations (Pennsylvania State University Press).
1989
Morality in Plague Time : Aids in Theological Perspective (Concordia Pub. House).
1991
Faith and Faithfulness : Basic Themes in Christian Ethics (University of Notre Dame Press).
1995
Body, Soul, and Bioethics (University of Notre Dame Press).
1996
Bioethics : A Primer for Christians (Paternoster).
1996
Letters to Ellen (Eerdmans).
1998
The Taste for the Other : The Social and Ethical Thought of C.S. Lewis (Eerdmans).
2000
Things That Count : Essays Moral and Theological (ISI Books).
2000
Working : Its Meaning and Its Limits (University of Notre Dame Press).
2002
Love Taking Shape : Sermons on the Christian Life (Eerdmans)