IMPLEMENTATION OF PROBLEM BADES LEARNING (PBL) BASED LESSON STUDY (LS) MODEL TO IMPROVE COGNITIVE LEARNING OUTCOMES VIII STUDENTS OF TONDANGOW CHRISTIAN JUNIOR HIGHT SCHOOL. Nova. Pub. Published online August 14, 2023:1-10. Accessed October 14, 2025. https://novateurpublication.org/index.php/np/article/view/173