1. S. Songwanich, (2017), Chinese expat community swells in Thailand, The Nation. Retrieved from http://www.nationmultimedia.com
2. P. Vapattanawong, (2015) (Foreigners in Thailand). Retrieved from http://www.ms.ipsr.mahidol.ac.th/ConferenceXI/Download/Presentation/2558-12-Patama.pdf
3. A. Diamond, L. Walkley, P. Forbes, T. Hughes and J. Sheen. (2011). Global Graduates into Global Leaders. Retrieved from http://www.ncub.co.uk/reports/global-graduates-into-global-leaders.html
4. J.N. Martin, & T.K. Nakayama, (2010), Intercultural communication in contexts. New York, NY: McGraw-Hill.
5. J.S. Allwood, (1976), Linguistic communication as action and cooperation, Monographs in Linguistics 2. Göteborg: Dept. of Linguistics, University of Göteborg.