Roo-yuenyong W, Kongpet Y. Leadership Development that Creates Leaders in School Administrators under the Office of Secondary Education Service Area in the Northeastern Region. dhammathas [internet]. 2022 Sep. 30 [cited 2026 Jan. 8];22(3):29-40. available from: https://so06.tci-thaijo.org/index.php/dhammathas/article/view/256866