Singkam K, Buasuwan P, Nanthachai S. Perceptions of Professionalism Among Teachers of Different Generations in Schools under the Phrae Secondary Education Service Area Office. SDU. Grad. J. [internet]. 2025 Oct. 21 [cited 2026 Aug. 29];21(3):1-13. available from: https://so19.tci-thaijo.org/index.php/SDUGSAJ/article/view/1306