SIMANJUNTAK, Nasri; SINAGA, Samuel Juliardi; SITUMORANG, Adi Suarman. 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, [S. l.], v. 3, n. 5, p. 6173–6190, 2023. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/5580. Acesso em: 24 apr. 2026.