Birth Control Methods - Implant. Bedsider.org. National Campaign to Prevent Teen and Unplanned Pregnancy. February 2016 [17 March 2016]. (原始内容存档于2021-09-28).
Birth Control Methods - Implant. Bedsider.org. National Campaign to Prevent Teen and Unplanned Pregnancy. February 2016 [17 March 2016]. (原始内容存档于2021-09-28).