Ali, Elsiska Ningsi, et al. “Developing Problem-Based Learning Modules for Flat-Sided Geometry to Facilitate students’ Mathematical Connection Skills”. Jurnal Absis: Jurnal Pendidikan Matematika Dan Matematika, vol. 7, no. 1, Aug. 2024, pp. 95-105, doi:10.30606/absis.v7i1.2597.