Rini B, Atmaja H, Setyowati D. The Effectiveness of The Thematic Instructional Materials in Improving Social Sciences Basic Competence by Using Problem-Based Learning Model in Elementary School. JPE [Internet]. 5Aug.2018 [cited 24Nov.2024];8(1):10-5. Available from: https://journal.unnes.ac.id/sju/jpe/article/view/24624