Access to emergency contraception. Number 542, November 2012. The American College of Obstetricians and Gynecologists Committee Opinion. https://www.acog.org/Clinical-Guidance-and-Publications/Committee-Opinions/Committee-on-Health-Care-for-Underserved-Women/Access-to-Emergency-Contraception. Accessed January 2018.
Emergency contraception. Planned Parenthood. https://www.plannedparenthood.org/learn/morning-after-pill-emergency-contraception. Accessed January 2018.