Kheawpan, A., and W. Sriraksa. “Learning Outcomes of the 21st Century Learning Skills Development by Flipped Classroom in Visual Art Subject on Ceramic Design Topic for Grade 8 Students”. Journal of Innovation and Learning Sciences, vol. 13, no. 1, Mar. 2019, pp. 157-70, https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/181158.