Kongsomjit, Suree. “ภาษาอังกฤษที่ควรทราบในยุคธุรกิจ”. LEARN Journal: Language Education and Acquisition Research Network 1 (December 23, 2012): 40–48. accessed October 10, 2026. https://so04.tci-thaijo.org/index.php/LEARN/article/view/102745.