Ardika G, Sukmana AIWIY, Sudarma IK. Problem-Based Learning E-Book for Natural and Social Sciences in Fourth-Grade of Elementary Schools. JP2 [Internet]. 2024 Oct. 25 [cited 2025 Mar. 12];7(3):492-503. Available from: https://ejournal.undiksha.ac.id./index.php/JP2/article/view/82690