Putra DA, Meirza Nanda Faradita, Dewi Masyita Faradillah. Problem-Based Learning (PBL) Instructional Materials for Enhancing Mathematics Learning Outcomes of Elementary School Students. Ehdj [Internet]. 2023Sep.30 [cited 2024Nov.24];8(2):1-9. Available from: https://journal2.unusa.ac.id/index.php/EHDJ/article/view/5018