Peningkatan Hasil Belajar Matematika Melalui Model Pembelajaran Problem Based Learning (PBL) Siswa Kelas 4 SD. Jurnal Mercumatika : Jurnal Penelitian Matematika dan Pendidikan Matematika, [S. l.], v. 3, n. 2, p. 71–78, 2019. DOI: 10.26486/jm.v3i2.694. Disponível em: https://ejurnal.mercubuana-yogya.ac.id/index.php/mercumatika/article/view/694. Acesso em: 30 jun. 2026.