1. International Consortium for Emergency Contraception. Using Oral Birth Control Pills as EC http://www.cecinfo.org/custom-content/uploads/2014/12/ICEC_Yuzpe_FactSheet_2014.pdf
2. A review of global access to emergency contraception;Westley;Int J Gynecol Obstet,2013
3. The Emergency Contraception Website: Types of Emergency Contraception [country-by-country information on emergency contraception] http://ec.princeton.edu/worldwide/default.asp
4. A prospective randomized comparison of levonorgestrel with the Yuzpe regimen in post-coital contraception;Ho;Hum Reprod,1993
5. Task Force on Postovulatory Methods of Fertility Regulation. Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception;Lancet,1998