Tadngoen, Rungnapa, Charin Mangkhang, and Sawaeng Saenbutr. “Guidelines for Integrative Environmental Learning to Enhance Environmental Citizenship Skills of Secondary Stu-Dents at Udomdarunee School”. Trends of Humanities and Social Sciences Research 9, no. 2 (September 28, 2021): 53–71. Accessed April 17, 2024. https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/222373.