“EFEKTIVITAS MODEL PROBLEM BASED LEARNING DAN MODEL GROUP INVESTIGATION BERBANTU MACROMEDIA FLASH TERHADAP KEMAMPUAN PEMAHAMAN KONSEP MATEMATIS”. Prosiding Seminar Nasional Matematika Dan Pendidikan Matematika, vol. 4, Aug. 2019, pp. 309-17, http://103.98.176.39/index.php/senatik/article/view/71.