Lubis, Erni Triyani, Juliandi Harahap, and Nuraini Nuraini. “Analysis Of Potential Fraud Control At Metta Medika Hospital Sibolga”. Science Midwifery 10, no. 1, October (October 31, 2021): 332–240. Accessed June 19, 2026. https://midwifery.iocspublisher.org/index.php/midwifery/article/view/213.