Chumthong S. THE DEVELOPMENT OF INTERNAL SUPERVISION MODEL TO PROMOTE EFFICIENCY OF TEACHERS’ LEARNING MANAGEMENT IN THE 21ST CENTURY UNDER SURATTHANI PRIMARY EDUCATIONAL SERVICE AREA OFFICE 1 . JEI [internet]. 2024 Dec. 15 [cited 2025 Apr. 16];26(4):326-40. available from: https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/270140