Susilowati, B., C. Wekadigunawan, B. Murti, and S. Rahardjo. “Factors Associated With Use of Intra-Uterine Device in Women of Reproductive Age in Boyolali, Central Java”. Journal of Maternal and Child Health, vol. 3, no. 4, Aug. 2018, pp. 252-60, https://thejmch.com/index.php/thejmch/article/view/107.