Tasya Natali Sihombing, and Pargaulan Siagian. “Improving Learning Outcomes Of Class X Students In Mathematics Learning At SMA Negeri 2 Medan Through The Group Investigation (GI) Type Cooperative Model”. JURNAL RISET RUMPUN ILMU PENDIDIKAN 2, no. 2 (July 26, 2023): 182–198. Accessed May 22, 2024. https://prin.or.id/index.php/JURRIPEN/article/view/1585.