Committee on Adolescent Health Care Long-Acting Reversible Contraception Working Group, The American College of Obstetricians and, Gynecologists (October 2012). "Committee opinion no. 539: adolescents and long-acting reversible contraception: implants and intrauterine devices". Obstetrics and Gynecology. 120 (4): 983–8. doi:10.1097/AOG.0b013e3182723b7d. PMID22996129.
Committee on Adolescent Health Care Long-Acting Reversible Contraception Working Group, The American College of Obstetricians and, Gynecologists (October 2012). "Committee opinion no. 539: adolescents and long-acting reversible contraception: implants and intrauterine devices". Obstetrics and Gynecology. 120 (4): 983–8. doi:10.1097/AOG.0b013e3182723b7d. PMID22996129.