Kartamiharja, Momo Rosbiono, Wahyu Sopandi, and Dini Anggraeni. “Implementation of Problem-Based Learning (PBL) Approach in Chemistry Instructional With Context of Tofu Liquid Waste Treatment”. International Journal of Learning, Teaching and Educational Research 19, no. 5 (May 31, 2020): 47–77. Accessed May 16, 2026. https://ijlter.net/index.php/ijlter/article/view/331.