Oktapratama, R., Chrismastianto, I. A. W. and 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), pp. 108–117. doi: 10.19166/johme.v3i1.994.