Sandi Wahyuni, et al. “Penggunaan Model Problem Based Learnıng Untuk Menıngkatkan Hasıl Belajar Matematıka Kelas V Sekolah Dasar”. Journal of Innovation in Primary Education, vol. 1, no. 2, Dec. 2022, pp. 122-3, https://ejournal.unma.ac.id/index.php/jipe/article/view/3942.