Bahri, S. and Bakri, F. 2018. Implementation of Problem-Based Learning to Improve Physics Learning Outcomes of Class X IPA-4 in SMA 59. Jurnal Penelitian & Pengembangan Pendidikan Fisika. 4, 1 (Jun. 2018), 35 - 46. DOI:https://doi.org/10.21009/1.04105.