Simanjuntak, M. F. and Sudibjo, N. (2019) “MENINGKATKAN KETERAMPILAN BERPIKIR KRITIS DAN KEMAMPUAN MEMECAHKAN MASALAH SISWA MELALUI PEMBELAJARAN BERBASIS MASALAH [IMPROVING STUDENTS’ CRITICAL THINKING SKILLS AND PROBLEM SOLVING ABILITIES THROUGH PROBLEM-BASED LEARNING]”, JOHME: Journal of Holistic Mathematics Education, 2(2), pp. 108–118. doi: 10.19166/johme.v2i2.1331.