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DEVELOPMENT GUIDANCE PRACTICAL OF PROBLEM BASED LEARNING CHEMISTRY GUIDE FOR COLOID MATERIALS FOR CLASS XI SMA/MA. EPK [Internet]. 2023 Apr. 7 [cited 2026 Oct. 23];4(2):1-7. Available from: http://entalpipendidikan.ppj.unp.ac.id/index.php/epk/article/view/260