Tonpo K. The Language Usage and Techniques of the Speech in Graduation Ceremony Given at Srinakharinwirot University. GS KKU HS [internet]. 2020 Dec. 16 [cited 2026 Sep. 15];8(3):178-92. available from: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/247824