Gunardi, Eka R, and Frista Ballo. “The Efficacy of Monoplant® and Indoplant® As Contraceptive Methods: A Comparative Study”. Indonesian Journal of Obstetrics and Gynecology, vol. 5, no. 2, Oct. 2017, pp. 94-98, doi:10.32771/inajog.v5i2.526.