Yamjarat S, Jaoensuk N, Ekpetch C. Visionary Leadership Development Model for Subject Matter Group Leaders Secondary Education Area Office, Suratthani Chumphon in Suratthani Province. RJPJ [internet]. 2021 Sep. 19 [cited 2026 Sep. 28];15(42):220-35. available from: https://so05.tci-thaijo.org/index.php/RJPJ/article/view/252843