P. Chinporn and P. Phoojomjit, “The Guidelines for Development of Servant Leadership of School Administrators Under The Secondary Educational Service Area Office Nakhon Ratchasima: The Guidelines for Development of Servant Leadership of School Administrators Under The Secondary Educational Service Area Office Nakhon Ratchasima”, rtnb, vol. 5, no. 2, pp. 449–463, Aug. 2023.