Aebsapap , Teerasak, Boonchan Sisan, and Pariyaporn Tungkunanan. 2022. “Synthesis and Confirmatory Factor Analysis of Components of Functional Competencies of Heads of Departments”. International Journal of Instruction 15 (2):473-86. https://e-iji.net/ats/index.php/pub/article/view/394.