Two wings: integrating faith and reason
San Francisco: Ignatius Press, 2018 * Co-author, with Brian Clayton; forthcoming
The Problem of Natural Law
Lanham, Maryland: Lexington Books, 2007
Gladly to Learn and Gladly to Teach: Essays on Religion and Political Philosophy in Honor of Ernest L. Fortin, A.A.
Lanham, Maryland: Lexington Books, 2002 * Co-editor, with Michael P. Foley
Nova Doctrina Vetusque: Essays on Early Christianity in Honor of Fredric W. Schlatter, S.J.
New York: Peter Lang, 1999 * Co-editor, with Catherine Brown Tkacz
Piety and Humanity: Essays on Religion and Early Modern Political Philosophy
Lanham, Maryland: Rowman & Littlefield, 1997 * Editor and Author of Introduction
Augustine: Political Writings
Indianapolis: Hackett Publishing, 1994 * Co-editor and Co-translator, with Ernest L. Fortin and Michael W. Tkacz