Promsiri , N. , Jantarak , S. and Nanthasri, W. 2021. Teachers’ Leadership Affecting Learners’ Quality in the 21st Century in the Schools under Sakon Nakhon Primary Educational Service Area Office 1. Journal of Graduate School, Pitchayatat, Ubon Ratchathani Rajabhat University. 16, 3 (Dec. 2021), 163–176.