1. McCullough LB, Chervenak FA. Ethics in Obstetrics and Gynecology. New York: Oxford University Press, 1994.
2. Beauchamp TL, Childress JF. Principles of Biomedical ethics. 4th ed. New York: Oxford University Press, 1994.
3. Hippocrates. Epidemics i:xi. [Jones, W.H.S. Trans.]. Loeb Classical Library, vol. 147. Cambridge: Harvard University Press, 1923.
4. Faden RR, Beauchamp TL. A History and Theory of Informed Consent. New York: Oxford University Press, 1986.
5. Outcomes of extremely-low-birth-weight infants between 1982 and 1988;Hack;New Engl J Med,1989