Sahatsathatsana, Sattra, Suphattra Singban, Khanitta Rosdee, and Jonathan Wary. “Foreign Visitors’ Satisfaction towards English Oral Communication with Thai Vendors in Khon Kaen Province”. Journal of English Language and Linguistics 4, no. 1 (June 30, 2023): 30–45. accessed July 1, 2025. https://so17.tci-thaijo.org/index.php/JEL/article/view/27.