, 2004, The ethics of controlled clinical trials, in G. Khushf (ed.), Handbook of bioethics, Dordrecht, Springer, pp. 337-352.
, 1997, Whatever happened to research ethics?, in R. A. Carson & C. R. Burns (eds.), Philosophy of medicine and bioethics, Dordrecht, Springer, pp. 275-286.
, 1978a, Szasz on mental illness, in T. Engelhardt & S. Spicker (eds.), Mental health: philosophical perspectives, Dordrecht, Springer, pp. 251-257.