Ma, X. ., J. . Maneeku, and C. . Mangkhang. “A Desirable Perception and Behavior of Thai Courtesy of Chinese Students in Chiang Mai University”. Journal of Graduate MCU KhonKaen Campus, vol. 6, no. 2, June 2019, pp. 222-35, https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/243535.