Upaya Meningkatkan Motivasi Belajar Matematika Siswa SMP Menggunakan Model Pembelajaran Problem Based Learning (PBL). Jurnal Pendidikan, [S. l.], v. 21, n. 1, p. 1–14, Disponível em: https://e-journal.upr.ac.id/index.php/JPN/article/view/1626. Acesso em: 22 dec. 2024.