ฺBoonyaruksa S. “English Code Mixing Characteristics in Working of Hotel Personnel in Nonthaburi Province”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences, vol. 41, no. 4, Dec. 2021, pp. 148-67, https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/246050.