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. [Internet]. 2023 Aug. 14 [cited 2025 Oct. 14];:1-10. Available from: https://novateurpublication.org/index.php/np/article/view/173