Mahfuz Hazemi Alim. 2021. “PENERAPAN MODEL PROBLEM BASED LEARNING ( PBL) TERHADAP HASIL BELAJAR SISWA PADA MATERI PENCEMARAN AIR DI SMPS ISLAM QIBLATUL MUSTAQIM”. Jurnal Biologi Konstektual (JBK) 3 (1):48-52. https://e-journal.unmas.ac.id/index.php/JBK/article/view/8064.