Wahyuningsih, L. and 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 (Jul. 2019), 28–34. DOI:https://doi.org/10.24114/jh.v10i1.14135.