Lakul, A., and H. Rummabut. “Development of Thai Reading and Writing Spells Using Skill Exercises of Thai Language Learning Subject Group Grade 1 Students at Pratuchai School Phra Nakhon Si Ayutthaya Province”. Dhammathas Academic Journal, vol. 23, no. 3, Sept. 2023, pp. 17-28, https://so06.tci-thaijo.org/index.php/dhammathas/article/view/264902.