Therdbhuthadham, T. ., and N. Muakchim. “Confirmatory Factor Analysis of Servant Leadership of Fire and Rescue Officer and Assistants in Bangkok Metropolitan Administration”. Rajapark Journal, vol. 15, no. 41, July 2021, pp. 114-25, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/250670.