Saputra, Moch Dwi, Siti Alimah, and Ning Setiati. 2020. “Effectiveness of Student’s Critical Thinking Skill With Problem-Based Learning (PBL), Osborn Model and Integration of PBL-Osborn”. Journal of Innovative Science Education 9 (1), 71 - 76. https://doi.org/10.15294/jise.v8i1.32665.