BWARI , E. S.; BENUNG , R. P. 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, [S. l.], v. 1, n. 1, p. 81–86, 2023. Disponível em: https://billirijournals.com/index.php/bijes/article/view/13. Acesso em: 8 oct. 2025.