Nababan, Elnita, Yanty Maria Marbun, and Belsasar Sihombing. “Efektivitas Model Pembelajaran Problem Based Learning (PBL) Terhadap Pemahaman Konsep Dan Hasil Belajar Pada Materi Persamaan Garis Lurus Kelas VIII Di Smp Negeri 2 Tapian Dolok”. Innovative: Journal Of Social Science Research 4, no. 1 (January 13, 2024): 2754–2766. Accessed October 5, 2026. https://j-innovative.org/index.php/Innovative/article/view/8213.