1. The Belmont Report;National Commission for the Protection of Human Subjects,1979
2. Report of the Committee of Inquiry into Human Fertilization and Embryology,1984
3. Report on Fetal Viability and Clinical Practice,1985
4. Report by the Director General;World Health Organization,1979
5. When did I begin? Conception of the human individual in history, philosophy and science;Ford,1988