Hanafi, Ardi Nur, et al. “Meningkatkan Kemampuan Operasi Perkalian Siswa Dengan Menggunakan Model Problem Based Learning (PBL) Kelas 5B Di SDN 14 I Sungai Baung ”. Innovative: Journal Of Social Science Research, vol. 3, no. 3, July 2023, pp. 5731-8, https://j-innovative.org/index.php/Innovative/article/view/1611.