PENGARUH MODEL PROBLEM BASED LEARNING (PBL) BERBASIS CHILDREN LEARNING IN SCIENCE (CLIS) TERHADAP MOTIVASI BELAJAR PESERTA DIDIK. (2021). Karst: Jurnal Pendidikan Fisika Dan Terapannya, 4(2), 50-61. https://doi.org/10.46918/karst.v4i2.1127