Hasibuan, Shubuhan Syukri, Elis Rahmadani Hasibuan, and Sundut Azhari Hasibuan. “Penerapan Model Pembelajaran Group Investigasi Dalam Meningkatkan Kemampuan Representasi Matematis”. Journal of Information System and Education Development 2, no. 2 (June 5, 2024): 24–28. Accessed November 3, 2025. https://journal.mwsfoundation.or.id/index.php/jised/article/view/71.