*''The Foundations of Christian Bioethics''. Lisse: Swets & Zeitlinger, 2000. (ISBN 902651557X) *''The Foundations of Bioethics'', 2nd edition. New York: Oxford University Press, 1996.(ISBN 0195057368)*''Bioethics and Secular Humanism: The Search for a Commmon Morality''. Trinity Press, 1991.(ISBN 1563380005)*''Mind-Body: A Categorical Relation''. Nijhoff: Springer, 1973.(ISBN 9024715504)