Tonpo กาญจนา. “The Language Usage and Techniques of the Speech in Graduation Ceremony Given at Srinakharinwirot University”. KKU Research Journal (Graduate Studies) Humanities and Social Sciences 8, no. 3 (December 16, 2020): 178–192. Accessed June 27, 2022. https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/247824.