Tama, P., and N. Tantranont. “PERSONNEL DEVELOPMENT FOR THE OPERATION SKILLS STANDARDS OF THE REGIONAL EDUCATION OFFICE NO.15”. Journal of Education and Innovation, vol. 26, no. 1, Jan. 2024, pp. 280-9, https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/262785.