Wahyuningsih, L., & Wahyudi, W. (2019). IMPROVING EFFORTS OF CRITICAL THINKING OF STATISTICS MATERIAL USING PROBLEM BASED LEARNING MODEL IN FIFTH GRADE MELUNG ELEMENTARY SCHOOL. JURNAL HANDAYANI PGSD FIP UNIMED, 10(1), 28–34. https://doi.org/10.24114/jh.v10i1.14135