“KEEFEKTIFAN MODEL PEMBELAJARAN KOOPERATIF TIPE GROUP INVESTIGATION PADA MATERI GEOMETRI BERBANTUANGEOGEBRA DITINJAU DARI KEMAMPUAN REPRESENTASI MATEMATIKA DANSELF-EFFICACY”, NasPen, vol. 1, no. 1, pp. 438–446, Oct. 2017, Accessed: Oct. 10, 2026. [Online]. Available: https://ejournal.mandalanursa.org/index.php/ProsPen/article/view/360