Klinchai, Y., Chanchaiy Poolsuk, P., & Phramangsang, N. (2022). The 21St Century Ethical Leadership Development Model of School Administrators Under the Kamphaeng Phet Elementary Education Service Area Office. Journal of Graduate Research, 13(1), 123–137. retrieved from https://so02.tci-thaijo.org/index.php/banditvijai/article/view/251278