Yanti, Risma, Nahor Murani Hutapea, and Rini Dian Anggraini. “The Development of Problem-Based Learning Worksheets to Facilitate Mathematical Problem-Solving Skills in Relation and Function Topics”. Jurnal Absis: Jurnal Pendidikan Matematika dan Matematika 7, no. 1 (August 30, 2024): 85–94. Accessed September 27, 2024. https://journal.upp.ac.id/index.php/absis/article/view/2480.