Sri-iam, S., and K. . Klangphahol. “Development of Learning Packages to Enhance Spelling Skills with Active Learning Processes to Develop Spelling Skills for Grade 1 Students”. Dhammathas Academic Journal, vol. 22, no. 3, Sept. 2022, pp. 335-48, https://so06.tci-thaijo.org/index.php/dhammathas/article/view/253254.