1. Mose 18 Vers 14.
2. www.nytimes.com/1997/04/25/.../pregnant-at-63-why-not.html.
3. Beauchamp TL. Philosophical ethics. An introduction to moral philosophy. New York: McGraw Hill; 2001.
4. Hinman L. A pluralistic approach to moral theory. 5th ed. Boston: Cengage Learning; 2012.
5. Beauchamp TL, Childress JF. Principles of biomedical ethics. Oxford: Oxford University Press; 2001.