NUURUL HIDAAYATULLAAH, HASAN, and DWIKORANTO. “IMPLEMENTASI PROBLEM BASED LEARNING UNTUK MELATIHKAN KEMAMPUAN PROBLEM SOLVING FISIKA PESERTA DIDIK”. IPF: Inovasi Pendidikan Fisika, vol. 8, no. 2, July 2019, https://ejournal.unesa.ac.id/index.php/inovasi-pendidikan-fisika/article/view/28602.