NAINGGOLAN, H. N. Upaya Peningkatan Hasil Belajar Matematika Pada Materi Integral Dengan Mengunakan Model Pembelajaran Berbasis Problem Based Learning. Jurnal Siklus: Penelitian Tindakan Kelas (PTK), [S. l.], v. 2, n. 2, p. 375–384, 2024. Disponível em: https://ejournal.edutechjaya.com/index.php/siklus/article/view/869. Acesso em: 25 jul. 2026.