Unique Reference Number	Abstract Name
1	Speroff L, Darney P. A clinical guide for contraception. 5th ed. Philadelphia: Lippincott Williams & Wilkins;2011. Chapter 2, Oral Contraception; p. 99-100. Accessed on 31st May 2021.
2	Birth Control Pills: Types, Effectiveness, and More [Internet]. Healthline. 2018 [cited 31 May 2021]. Available from: https://www.healthline.com/health/birth-control-pills#benefits. Accessed on 31st May 2021.
3	Trussell J, Stewart F, Guest F, Hatcher R. Emergency Contraceptive Pills: A Simple Proposal to Reduce Unintended Pregnancies. Family Planning Perspectives. 1992;24(6):269.