Nugraheni, Wahyu Nur, and Sutama. “Problem Based Learning Oriented Thematic Worksheets: Increased Discipline of Elementary School Students”. Journal of Education Research and Evaluation 7, no. 2 (May 19, 2023): 252–258. Accessed July 17, 2024. https://ejournal.undiksha.ac.id/index.php/JERE/article/view/59184.