Widia Wulandari, Siti Darwa Suryani, Irwandi Irwandi. Development of Problem-Based Learning Student Worksheets to Train Critical Thinking Skills of Students in Biology Education Study Program . IJER [Internet]. 2025 Sep. 30 [cited 2026 Mar. 4];2(3):53-6. Available from: https://international.aripi.or.id/index.php/IJER/article/view/481