Simmathong W, Suthiyam U. Current Status, Needs and Problems in Promoting Professional Advancement of Teachers in the Role of School Administrators Under the office of The Secondary Education Service Area, Pathum Thani. GS KKU HS [internet]. 2026 Jul. 22 [cited 2026 Sep. 30];13(3):1-9. available from: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/275920