Changkhaen A, Toomnan P. Guidelines for Developing Learning Leadership of School Administrator under The Secondary Educational Service Area Office Nongkhai. GS KKU HS [internet]. 2026 Jul. 22 [cited 2026 Sep. 29];13(3):89-100. available from: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/279119