1. 1. Webster's Third International Dictionary. Springfield Massachusetts G & C. Merriam Co. 1965.
2. 2. Potter VR: Bioethics the science of survival. Perspect Biol Med 1970; 14:127-153.
3. 3. Potter VR: Bioethics. Bridge to the Future. Englewood Cliffs New Jersey Prentice-Hall 1971.
4. 4. Walters L.: Bioethics as a field of ethics in Beauchamp TL Walters L (eds): Contemporary Issues in Bioethics Belmont California Wadsworth 1978. pp 48-51.
5. 5. Fletcher JF: Situation Ethics: The New Morality. Philadelphia Westminister Press 1966.