Maka, Athithaya, Banjong Burinprakhon, and Chamrat Sukpae. “Developing the Skill of Reading Aloud Diphthongs Thai Language by Using the Skill Exercises of Secondary 1 Students at Wapi Pathum School Wapi Pathum District Maha Sarakham Province”. Rajamangala University of Technology Tawan-ok Social Science Journal 12, no. 2 (December 31, 2023): 1–9. Accessed May 15, 2024. https://so05.tci-thaijo.org/index.php/SocialJournal2rmutto/article/view/265676.