Eklesia.R T, Kusuma YY, . N. The Implementation of the Problem-Based Learning (PBL) Model to Improve Student Activeness in Elementary School. edumaspuljr [Internet]. 2026Mar.1 [cited 2026Apr.5];10(1). Available from: https://jurnal.unimen.cloud/index.php/maspuljr/article/view/9266