Asniadarni A. UPAYA MENINGKATKAN AKTIVITAS DAN HASIL BELAJAR KIMIAMELALUI MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL). jptam [Internet]. 2018 Jun. 24 [cited 2024 Jul. 3];2(2):556-72. Available from: https://jptam.org/index.php/jptam/article/view/8