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LITTHILEE P, TOCHOT P, PONGBORIBOON K. GUIDELINES FOR DEVELOPING SCHOOLS INTO HAPPY ORGANIZATIONS UNDER KHON KAEN PRIMARY EDUCATIONAL SERVICE AREA OFFICE 2. jhsmbuisc [internet]. 2026 Apr. 27 [cited 2026 Sep. 12];7(1):25-37. available from: https://so06.tci-thaijo.org/index.php/jhsmbuisc/article/view/292114