Ratchadawisitkul, Kedsuda, and Jutharat Nirundorn. “Administrators’ Role in Leadership Development of Teachers Under the Phetchaburi Primary Educational Service Area Office 1”. Journal of Humanities and Social Sciences, Rajapruk University 6, no. 2 (August 25, 2020): 14–26. accessed September 11, 2026. https://so03.tci-thaijo.org/index.php/rpu/article/view/246212.