Tipung Uvat , Rita, Didimus Tanah Boleng, and Sonja Vera Tineke Lumowa. 2021. “THE INFLUENCE OF PROBLEM-BASED LEARNING AND GROUP INVESTIGATION LEARNING MODEL ON CRITICAL THINKING SKILLS AND STUDENTS’ LEARNING MOTIVATION”. IJER - INDONESIAN JOURNAL OF EDUCATIONAL REVIEW 8 (2), 12-21. http://103.8.12.212:33180/unj/index.php/ijer/article/view/26996.