Afifah, Elva Pristy, et al. “Efektivitas Problem Based Learning Dan Problem Solving Terhadap Kemampuan Berpikir Kritis Siswa Kelas V Dalam Pembelajaran Matematika”. MUST: Journal of Mathematics Education, Science and Technology, vol. 4, no. 1, July 2019, pp. 95-107, doi:10.30651/must.v4i1.2822.