Tawica Mekarkakorn ถ. . เ., and Suwanna Narkwiboonwong ส. . น. “A Synthesis Elements of Professional Vocational Education Teachers in Thailand”. Dusit Thani College Journal, vol. 11, no. 2, Apr. 2018, pp. 271-83, https://so01.tci-thaijo.org/index.php/journaldtc/article/view/120028.