Pujeeb , Nuttida, Poonarat Pichayapaiboon, and Ekachai Keesookpun. 2020. “The Model of Teaching Competency Development for Visual Art Teachers of Secondary Schools”. Journal of Education Studies 48 (3). Bangkok, Thailand:106-24. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/244992.