Nasir, R., U. M. J. Siahaan, and R. A. Prafianti. “Analysis of Mathematical Instruction Barriers in Terms of Developing Students’ Mathematical Reasoning”. Vygotsky: Jurnal Pendidikan Matematika Dan Matematika, vol. 5, no. 1, Feb. 2023, pp. 65-76, doi:10.30736/voj.v5i1.723.