Oktapratama, R., Chrismastianto, I. A. W., & Hidayat, D. (2019). THE IMPLEMENTATION OF THE PROBLEM-BASED LEARNING METHOD TO ENHANCE GRADE 7 STUDENTS’ CRITICAL THINKING SKILLS IN LEARNING MATHEMATICS AT SMP HOLLAND VILLAGE MANADO. JOHME: Journal of Holistic Mathematics Education, 3(1), 108–117. https://doi.org/10.19166/johme.v3i1.994