Ratchadawisitkul, Kedsuda, and Jutharat Nirundorn. 2020. “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 (2):14-26. https://so03.tci-thaijo.org/index.php/rpu/article/view/246212.