Fitriani, Fitriani, Nurhuda Nurhuda, and Ade In Ina. “ Improving students’ Activeness and Critical Thinking Skills through Problem Based Learning”. Journal of Science and Education (JSE) 2, no. 1 (September 25, 2021): 19-29. Accessed December 22, 2024. https://jse.rezkimedia.org/index.php/jse/article/view/60.