Rini, Bekti, Hamdan Atmaja, and Dewi Setyowati. “The Effectiveness of The Thematic Instructional Materials in Improving Social Sciences Basic Competence by Using Problem-Based Learning Model in Elementary School”. Journal of Primary Education 8, no. 1 (August 5, 2018): 10-15. Accessed November 24, 2024. https://journal.unnes.ac.id/sju/jpe/article/view/24624.