Tangjongrach, P., and D. Thawinkarn. “A MULTI-GENERATION MANAGEMENT MODEL FOR SCHOOL PERSONNEL UNDER THE OFFICE OF UDONTHANI PRIMARY EDUCATIONAL SERVICE AREA 2”. Phranakhon Rajabhat Research Journal : Humanities and Social Sciences, vol. 16, no. 1, May 2021, pp. 140-59, https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/251007.