Sarakhan, P., N. Kankhunthod, and N. Hokpanna. “Developing a Phonics-Based Learning Model Combined with Colored Letters to Enhance Reading and Spelling Skills According to Standard Spelling Rules for Fourth-Grade Elementary School Students”. Journal of Integration Social Sciences and Development, vol. 6, no. 2, Aug. 2026, pp. 132-40, https://so15.tci-thaijo.org/index.php/JISSD/article/view/4114.