“Exploration of the Keteng-Keteng Musical Instrument in Learning the Surface Area of Cylinders at SMPS Deli Murni Bandar Baru”. Jurnal Ilmiah Mandala Education 11, no. 3 (August 1, 2025): 581–587. Accessed June 30, 2026. https://ejournal.mandalanursa.org/index.php/JIME/article/view/9096.