, 1981a, Rejoinder to Hans Jonas, in D. Callahan & T. Engelhardt (eds.), The roots of ethics, Dordrecht, Springer, pp. 213-219.
, 1981b, Theology and ethics: an interpretation of the agenda, in D. Callahan & T. Engelhardt (eds.), The roots of ethics, Dordrecht, Springer, pp. 175-196.