Thammawong , N. ., P. . Thongpanchang, U. . Pitchprasert, and P. . Wisetsang. “Administrative Skills in the 21st Century of the Basic School Administrators in the Schools under the Secondary Educational Service Area Office, Si Sa Ket- Yasothon”. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University, vol. 17, no. 2, Aug. 2022, pp. 31-41, https://so02.tci-thaijo.org/index.php/Pitchayatat/article/view/252246.