Lubis, R. N. ., L. E. . Hakim, and T. A. . Aziz. “STUDENTS’ MATHEMATICAL COMMUNICATION SKILLS REVIEWED FROM SELF-CONFIDENCE THROUGH APPROACH PROBLEM-BASED LEARNING (PBL)”. Tesseract: International Journal of Geometry and Applied Mathematics, vol. 1, no. 1, Mar. 2023, pp. 9-20, doi:10.57254/tess.v1i1.7.