N.P.D Sinaga, Budiman, Bahtiar Girsang, Ewin Simbolon, Lintong S. Situmorang, and Yanti J. Nababan. “Program Bimbingan Gratis Matematika Di SMA Negeri 1 Pegagan Hilir”. Jurnal Pengabdian Masyarakat Bestari 1, no. 5 (August 30, 2022): 241–248. Accessed May 6, 2026. https://journal.formosapublisher.org/index.php/jpmb/article/view/964.