1.
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. GS KKU HS [Internet]. 2021 Dec. 12 [cited 2022 Jun. 29];9(3):84-95. Available from: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/248231