Kongtoei, Khamporn, Samoot Chamnan, and Sataporn Pruettikul. “Development of Ethical Leadership Indicators for School Principals Under Bangkok Metropolitan Administration”. Academic Journal of Thailand National Sports University 10, no. 2 (May 1, 2018): 237–250. Accessed May 18, 2024. https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/248640.