Sasmitha, Hijrana Mega, Pintaka Kusumaningtyas, Farah Erika, and Sumarioto Sumarioto. “Improving Problems Solving Skills through Problem-Based Learning of Oil Palm Empty Fruit Bunch Waste in Science Learning for Students at SMAN 1 Muara Badak”. Educational Studies: Conference Series 4, no. 2 (December 31, 2024): 111–1116. Accessed December 5, 2025. https://jurnal.fkip.unmul.ac.id/index.php/escs/article/view/4630.