Defi Yanti Hulu, Leni Marlina Laia, and Defi Susanti Duha. “DEVELOPMENT OF THE OPPORTUNITY MODULE TO IMPROVE HIGH SCHOOL LEVEL UNDERSTANDING ABILITY OF MATHEMATICAL CONCEPTS”. Afore : Jurnal Pendidikan Matematika 2, no. 1 (February 25, 2023): 26 - 36. Accessed July 4, 2025. https://www.jurnal.uniraya.ac.id/index.php/Afore/article/view/764.