Panggabean, R.D. and Simamora, P. 2016. EFFECT OF PROBLEM BASED LEARNING (PBL) MODEL ON STUDENT LEARNING OUTCOMES IN GEOMETRIC OPTICS SUBMATTER. Jurnal Pendidikan Fisika. 5, 1 (Jun. 2016), 38–43. DOI:https://doi.org/10.22611/jpf.v5i1.3705.