Simanjuntak, N., Sinaga, S. J., & Situmorang, A. S. (2023). Efektivitas Model Pembelajaran Problem Based Learning (PBL) Terhadap Kemampuan Pemahaman Matematis Siswa Pada Materi Sistem Persamaan Linear Dua Variabel (SPLDV) Kelas VIII SMP Negeri 13 Medan. Innovative: Journal Of Social Science Research, 3(5), 6173–6190. Retrieved from https://j-innovative.org/index.php/Innovative/article/view/5580