Wannapake, P., K. . Tongchalerm, and B. Jomhongbhibhat. “Development of Graphic Design Skills of Vocational Certificate Students, 2nd Year Using Online Lessons in Conjunction With Cooperative Learning Management With STAD Techniques”. Ubon Ratchathani Journal of Research and Evaluation, vol. 12, no. 2, Dec. 2023, pp. 73-84, https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/267741.