, 2015, Sanctity of life: a study in ambiguity and confusion, in L. M. Rasmussen, A. S. Iltis & M. J. . Cherry (eds.), At the foundations of bioethics and biopolitics, Dordrecht, Springer, pp. 75-85.
, 2006, Whose nature? natural law in a pluralistic world, in M. J. . Cherry (ed.), The death of metaphysics; the death of culture, Dordrecht, Springer, pp. 31-39.
, 2000, The logics of medicine: Discovery and evaluation, in A. Tymieniecka & Z. Zalewski (eds.), Life: the human being between life and death, Dordrecht, Kluwer, pp. 49-56.
, 1997a, Engelhardt's communitarian ethics: the hidden assumptions, in , Reading Engelhardt, Dordrecht, Springer, pp. 77-93.