HANPHITHAKPHONG, N., and Z. PING. “A STUDY ON THE BUSINESS CHINESE USAGE BY THE DEPARTMENT OF CHINESE AFFAIRS OF BANGKOK BANK”. Chinese Language and Culture Journal, vol. 4, no. 2, Dec. 2017, pp. 105-16, https://so02.tci-thaijo.org/index.php/clcjn/article/view/194050.