1. Planned Parenthood of Southeastern PA. v Casey, 505 U.S. 833 (1992)
2. Neonatal outcomes of extremely preterm infants from the NICHD Neonatal Research Network;Stoll;Pediatrics,2010
3. Cunningham FG. Williams Obstetrics, 23rd ed. New York: McGraw-Hill Education. 2009.
4. American Heart Association guidelines for cardiopulmonary resuscitation and emergency cardiovascular care;Kattwinkel;Circulation,2005
5. Guttmacher Institute. An Overview of Abortion Laws. 2013. 〈http://www.guttmacher.org/statecenter/spibs/spib_OAL.pdf〉