Rachakhom, P., and P. Chayayond. “Strategic Leading Organization towards Excellence Administrators of Private Vocational Education in the Northeast”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences, vol. 7, no. 3, Nov. 2019, pp. 44-57, https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/226876.