Londa TK, Lalamentik OJ. The Comparison Of Problem-Based Learning And Explicit Instruction Model For Maintaining Environmental Sustainability In Primary Schools Of Manado City. DeSciArs [Internet]. 2020Nov.12 [cited 2025Apr.20];1(1). Available from: https://ejurnal.unima.ac.id/index.php/desciars/article/view/417