Implementation of Problem-Based Learning Model to Improve Critical Thinking Skills and Tolerance Attitudes of Students at SD Negeri 21 Kapuh. AL FARABI [Internet]. 2024 Jun. 30 [cited 2025 Feb. 5];1(1):44-50. Available from: https://journal.alfarabibilingual.sch.id/index.php/alfarabi/article/view/26