SIMANJUNTAK, Paska Amoi; SIMAMORA, Rianita; TAMBUNAN, Lois Oinike. Pengaruh Model Pembelajaran Problem Based Learning Terhadap Pemahaman Konsep Matematis Siswa Pada Materi Sistem Persamaan Linear Dua Variabel di Kelas VIII SMP Negeri 7 Pematang Siantar. Innovative: Journal Of Social Science Research, [S. l.], v. 4, n. 1, p. 5329–5342, 2024. DOI: 10.31004/innovative.v4i1.8488. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/8488. Acesso em: 19 apr. 2026.