SARAGIH, S.; ., S.; ., M. The Validity of Problem Based Learning Model To Improve Problem Solving Ability. Advances in Social Sciences Research Journal, [S. l.], v. 5, n. 2, 2018. DOI: 10.14738/assrj.52.3755. Disponível em: http://116.203.177.230/index.php/ASSRJ/article/view/3755. Acesso em: 13 nov. 2024.