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- Tidwell, Charles H. "Non-Verbal Communication Modes." Andrews University. (May 21, 2010)http://www.andrews.edu/~tidwell/lead689/NonVerbal.html
- Wang, De-hua and Hui Li. "Nonverbal language in cross-cultural communication." Sino-US Englisth Teaching. October 2007. (May 21, 2010)http://www.linguist.org.cn/doc/su200710/su20071016.pdf