1. Obstetric ethics;McCullough,1994
2. Principles of biomedical ethics;Beauchamp,2009
3. Hippocrates. Epidemics i:xi. W.H.S. Jones, trans. Loeb Classical Library, vol. 147. Cambridge: Harvard University Press; 1923.
4. Ethical conflicts between mother and fetus in obstetrics;Strong;Clin Perinatol,1987
5. A history and theory of informed consent;Faden,1986