Lubis, Erni Triyani, Juliandi Harahap, and Nuraini Nuraini. 2021. “Analysis Of Potential Fraud Control At Metta Medika Hospital Sibolga”. Science Midwifery 10 (1, October):332-240. https://midwifery.iocspublisher.org/index.php/midwifery/article/view/213.