PENGARUH MODEL PROBLEM-BASED LEARNING (PBL) TERHADAP PENGUASAAN KONSEP IPA MATERI PENCEMARAN LINGKUNGAN. Biodik [Internet]. 2018Apr.23 [cited 2024Oct.5];2(2):62 - 66. Available from: https://mail.online-journal.unja.ac.id/biodik/article/view/4908