Theerathammakorn, Supawadee, Sarisak Soontornchai, and Phantipa Amornrit. “A competency-based learning model for distance education in the post-COVID-19 era: Sustainable manufacturing systems and the circular economy”. Humanities, Arts and Social Sciences Studies 24, no. 2 (August 23, 2024): 490–502. accessed March 15, 2025. https://so02.tci-thaijo.org/index.php/hasss/article/view/267798.