McCullough, Laurence B. (2002). “Philosophical Challenges in Teaching Bioethics: The Importance of Professional Medical Ethics and its History for Bioethics”. 《The Journal of Medicine and Philosophy》 27 (4): 395-402. doi:10.1076/jmep.27.4.395.8610. PMID12221500.|확인날짜=는 |url=을 필요로 함 (도움말)
McCullough, Laurence B. (2002). “Philosophical Challenges in Teaching Bioethics: The Importance of Professional Medical Ethics and its History for Bioethics”. 《The Journal of Medicine and Philosophy》 27 (4): 395-402. doi:10.1076/jmep.27.4.395.8610. PMID12221500.|확인날짜=는 |url=을 필요로 함 (도움말)