“THE EFFECT OF PROBLEM-BASED LEARNING (PBL) MODEL ON THE PROBLEM-SOLVING SKILLS IN SOCIAL SCIENCE IN ELEMENTARY SCHOOL”. Primary: Jurnal Pendidikan Guru Sekolah Dasar, vol. 10, no. 1, Feb. 2021, pp. 134-43, https://doi.org/10.33578/10.33578/jpfkip.v10i1.8052.