USSAPAN, C.; LAOSUWAN, D. . The Development of Learning Activities by Open Approach on the Topic Political Regime to Enhance Problem Solving Ability of Mathayom Suksa 4 Students. KKU Research Journal (Graduate Studies) Humanities and Social Sciences, [S. l.], v. 9, n. 3, p. 84–95, 2021. Disponível em: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/248231. Acesso em: 27 jun. 2022.