จิราสมบัติ วรวุฒิ. “Significant Social and Cultural Variable Factors Conditioning Language Use: A Case of Language Variation in Present Day Japanese”. Language and Linguistics 28, no. 2 (February 22, 2019): 84–95. accessed September 10, 2026. https://so04.tci-thaijo.org/index.php/joling/article/view/173825.