PHUPHASIT, K.; PRASERTSANG, P. . Developing Problem Solving Skills in Mathematics of Grade 4 Student by Using Constructivist Theory. Journal of Roi Et Rajabhat University, [S. l.], v. 14, n. 3, p. 141–148, 2020. Disponível em: https://so03.tci-thaijo.org/index.php/reru/article/view/239140. Acesso em: 24 apr. 2024.