Marx's Critique of Science and Positivism (Dordrecht, Holland: Kluwer Academic Publishers, 1988, ISBN90-277-2702-3)
Marx and the Ancients: Classical Ethics, Social Justice, and Nineteenth-Century Political Economy (Savage, MD: Rowman and Littlefield Publishers, 1990, ISBN0-8476-7641-2)
Eclipse of Justice: Ethics, Economics, and the Lost Traditions of American Catholicism, with Royal Rhodes[2] (Maryknoll, NY: Orbis Books, 1992)
Marx and Aristotle: Nineteenth-Century German Social Theory and Classical Antiquity, editor (Savage, MD: Rowman and Littlefield Publishers, 1992)
Dialectics and Decadence: Echoes of Antiquity in Marx and Nietzsche (Lanham, MD: Rowman and Littlefield Publishers, 1994, ISBN0-8476-7920-9)
Romancing Antiquity: German Critique of the Enlightenment from Weber to Habermas (Lanham, MD: Rowman and Littlefield Publishers, 1997)
Objectivity and the Silence of Reason: Weber, Habermas, and the Methodological Disputes in German Sociology (New Brunswick, NJ: Transaction Publishers, 2001)
Classical Horizons: The Origins of Sociology in Ancient Greece (Albany, NY: State University of New York Press, 2003)
Eclipse of Justice: Ethics, Economics, and the Lost Traditions of American Catholicism, with Royal Rhodes, paperback reprint (Eugene, Oregon: Wipf and Stock Publishers, 2009)
Dreams in Exile: Rediscovering Science and Ethics in Nineteenth-Century Social Theory (Albany, NY: State University of New York Press, 2009)
Marx and Social Justice. Ethics and Natural Law in the Critique of Political Economy (Chicago, IL: Haymarket Books, 2019), ISBN978-16-08-46011-3[3]
Justice Beyond Heaven: Natural Law and Economic Democracy in U.S., German, and Irish Catholic Social Thought with Royal W. Rhodes (Amherst, New York: Humanity Books, forthcoming)[2]