Siregar, T. F., F. H. Sitompul, S. S. Simbolon, Istiqomah, and C. Simanihuruk. “An Analysis of the Single Tuition Fee System at Medan State University”. META: Journal of Science and Technological Education, vol. 3, no. 2, Dec. 2024, pp. 145-51, https://meta.amiin.or.id/index.php/meta/article/view/130.