Bwari , E. S., & Benung , R. P. (2023). EFFECT OF PROBLEM-BASED LEARNING ON SECONDARY SCHOOL ECONOMICS STUDENTS CRITICAL THINKING AND COLLABORATIVE SKILLS IN BAUCHI LOCAL GOVERNMENT AREA, BAUCHI STATE. Billiri Journal of Education Studies, 1(1), 81–86. Retrieved from https://billirijournals.com/index.php/bijes/article/view/13