Mooltha S, Bhiasiri S. The research study the result of the visual art learning in creative Tung Isan Flag by project-based learning for Grade 9 students. JDSC [internet]. 2022 Aug. 2 [cited 2026 Oct. 7];9(2):123-36. available from: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/254523