SIAHAAN, Magdalena; SITUMORANG, Adi Suarman; SINAGA, Samuel Juliardi; MANULLANG, Dapot Tua. Efektivitas Model Problem Based Learning Terhadap Kemampuan Representasi Siswa Kelas VIII Materi Sistem Persamaan Linier Dua Variabel SMP Negeri 15 Medan. Innovative: Journal Of Social Science Research, [S. l.], v. 3, n. 2, p. 433–450, 2023. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/349. Acesso em: 24 jun. 2026.