Phunsangka, T., & Sirikase, B. (2023). 21st Century Administrator’s Skills Effective to Professional Learning Community of Schools Under Loei Primary Educational Service Area Office 1: 21st Century Administrator’s Skills Effective to Professional Learning Community of Schools Under Loei Primary Educational Service Area Office 1. RATANABUTH JOURNAL, 5(2), 582–600. retrieved from https://so07.tci-thaijo.org/index.php/rtnb/article/view/3274