Gusman, Hardina Briliyani, Rivanna Citraning Rachmawati, Maria Ulfah, and R. Edy Priyatna. “The Effectiveness of Problem-Based Learning (PBL) Model in Increasing students’ Cognitive Outcomes and Learning Motivation in Environmental Change Material”. Jurnal Mangifera Edu 8, no. 1 (August 13, 2023): 32-39. Accessed October 9, 2024. https://jurnal.biounwir.ac.id/index.php/mangiferaedu/article/view/172.