Astari, Sharli Yunita, Nila Kesumawati, and Misdalina. 2021. “Development of Social Arithmetic Teaching Materials Using IT-Based PMRI Approach for SMP Students”. Jurnal Pendidikan Matematika 15 (2):191-202. https://jpm.ejournal.unsri.ac.id/index.php/jpm/article/view/237.