Tangsa-nguantham A, Thipkong S, Chuntra C, Lertamornpong C. Using Van Hiele model to develop instruction in geometric proof for mathayomsuksa three students. kasetsart J. Soc. Sci. [Internet]. 2018 Apr. 1 [cited 2024 May 8];39(1):634-4. Available from: https://so04.tci-thaijo.org/index.php/kjss/article/view/242475