Mufdlilah, M., K. Aryekti, R. B. Johan, and D. Purnamasari. “Drop Out of Family Planning Acceptors Based on Contraceptive Methods in Rural and Urban Areas”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 36, no. 7, Dec. 2017, pp. 272-80, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8404.