เอี่ยมสอาด ชนิตา. “Management to Increase the Efficiency of Private Vocational Colleges”. Journal of Humanities and Social Sciences, Rajapruk University 4, no. supplement (December 24, 2018): 37–44. Accessed March 29, 2024. https://so03.tci-thaijo.org/index.php/rpu/article/view/159606.