Salsabilla, D. A., H. Prasetya, and B. Murti. “The Effect of Unplanned Pregnancy on Postpartum Depression: A Meta-Analysis”. Journal of Maternal and Child Health, vol. 5, no. 5, Sept. 2020, pp. 500-13, https://thejmch.com/index.php/thejmch/article/view/494.