Jitwattananon, Rachjikorn. “ompetency evelopment of ducational ersonnel ffice econdary chools in the ower entral egion”. Journal of Management Science Nakhon Pathom Rajabhat University 8, no. 1 (June 30, 2021): 63-78. ccessed December 4, 2021. https://so03.tci-thaijo.org/index.php/JMSNPRU/article/view/253265.