Indriani R, Wahyudin, Turmudi. The Effectiveness of Problem-Based Learning and Direct Instruction Models in Enhancing Mathematical Understanding among Elementary School Students. MOS [Internet]. 2023 Oct. 30 [cited 2024 Nov. 22];12(4):909-24. Available from: https://journal.institutpendidikan.ac.id/index.php/mosharafa/article/view/1201