Situmorang, Ruth Sahana, Nahor Murani Hutapea, and Armis. 2024. “Development of Problem-Based Learning Materials on Linear Programming to Facilitate students’ Mathematical Problem-Solving Skills”. Jurnal Absis: Jurnal Pendidikan Matematika Dan Matematika 7 (1):1-11. https://doi.org/10.30606/absis.v7i1.2339.