Luther Tandiarrang. “Improving Learning Outcomes of Pythagorean Theorem Using STAD Cooperative Learning Type for 8th Grade Students at SMPN 1 Rindingallo”. DEIKTIS: Jurnal Pendidikan, Bahasa dan Sastra 1, no. 2 (December 30, 2021): 343-352. Accessed October 7, 2026. https://www.dmi-journals.org/deiktis/article/view/511.