SULISTIYO, S. Penerapan Model Problem Based Learning untuk Meningkatkan Aktivitas dan Hasil Belajar Operasi Hitung Campuran Pada Siswa Kelas VI. Journal of Education Action Research, [S. l.], v. 5, n. 3, p. 398–404, 2021. DOI: 10.23887/jear.v5i3.37474. Disponível em: https://ejournal.undiksha.ac.id/index.php/JEAR/article/view/37474. Acesso em: 2 dec. 2024.