KEEFEKTIFAN MODEL PEMBELAJARAN KOOPERATIF TIPE GROUP INVESTIGATION PADA MATERI GEOMETRI BERBANTUANGEOGEBRA DITINJAU DARI KEMAMPUAN REPRESENTASI MATEMATIKA DANSELF-EFFICACY. NasPen [Internet]. 2017 Oct. 14 [cited 2026 Oct. 10];1(1):438-46. Available from: https://ejournal.mandalanursa.org/index.php/ProsPen/article/view/360