Mooltha, Sukonthamas, and Siribhong Bhiasiri. “The Research Study the Result of the Visual Art Learning in Creative Tung Isan Flag by Project-Based Learning for Grade 9 Students”. Journal of Research and Development Institute Rajabhat Maha Sarakham University 9, no. 2 (August 2, 2022): 123–136. Accessed May 19, 2024. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/254523.