Phelps, Rachel. Choosing a Birth Control Method. Association of Reproductive Health Professionals. Bayer Healthcare Pharmaceuticals, Conceptus, Inc., and Teva Pharmaceuticals. June 2014 [September 16, 2016]. (原始内容存档于2018-01-02).
Phelps, Rachel. Choosing a Birth Control Method. Association of Reproductive Health Professionals. Bayer Healthcare Pharmaceuticals, Conceptus, Inc., and Teva Pharmaceuticals. June 2014 [September 16, 2016]. (原始内容存档于2018-01-02).