Tangjongrach P, Thawinkarn D. A MULTI-GENERATION MANAGEMENT MODEL FOR SCHOOL PERSONNEL UNDER THE OFFICE OF UDONTHANI PRIMARY EDUCATIONAL SERVICE AREA 2. PNRU JHSS [internet]. 2021 May 25 [cited 2026 Oct. 8];16(1):140-59. available from: https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/251007