Kartamiharja, M. R., Sopandi, W., & Anggraeni, D. (2020). 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(5), 47–77. Retrieved from https://ijlter.net/index.php/ijlter/article/view/331