Hasna HR, Fajriyah K, Saputra HJ. The Effect of Blended Learning Based on The Problem-Based Learning Model Assisted by Puzzle Media on The Critical Thinking Skills of Fifth Grade Students on Ecosystem Themes. J. Educ. Technol. [Internet]. 2021 Apr. 8 [cited 2024 Nov. 30];5(1):14-22. Available from: https://ejournal.undiksha.ac.id/index.php/JET/article/view/29770