Sihombing, Betrik, and Glory Indira D. Purba. “Development of E-Modules Assisted by Geogebra Software to Improve High School Students’ Mathematical Problem Solving Abilities”. Jurnal Pendidikan Matematika 16, no. 1 (January 31, 2025): 44–51. Accessed February 23, 2025. http://jpm.uho.ac.id/index.php/journal/article/view/201.