Purba, Yeni Trisna. “Midwife Care in Ny. W 29 Years With Placenta Retension at the Midwife Clinic of L. Pangaribuan Village Simantin Pane Dame”. Science Midwifery, vol. 10, no. 2, Mar. 2022, pp. 751-4, https://midwifery.iocspublisher.org/index.php/midwifery/article/view/357.