Na Ubo, P., and R. Chai-ngam. “The Study of the Effect of Unplugged Coding Leaning Activity on Computational Thinking Skill of Grade 3 Students”. Journal of Education Rajabhat Maha Sarakham University, vol. 19, no. 2, Aug. 2022, pp. 144-53, https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/258621.