intala somnuek, Vaisopha K. Study of Competency of Teachers in 21st Centery Under Loei Primary Education Service Area Office 1: Study of Competency of Teachers in 21st Centery Under Loei Primary Education Service Area Office 1. rtnb [internet]. 2023 Apr. 30 [cited 2025 Dec. 8];5(1):228-39. available from: https://so07.tci-thaijo.org/index.php/rtnb/article/view/2533