1. Argyle, M.Bodily communication. New York: International Universities Press, 1975.
2. Ekman, P., Friesen, W.V., & Ellsworth, P.Emotion in the human face: Guidelines for research and integration of findings. New York: Pergamon Press, Inc., 1972.
3. Ellsworth, P., Friedman, H. S., Perlick, D., & Hoyt, M. Effects of direct gaze on subjects motivated to seek or avoid social comparison.Journal of Experimental Social Psychology, 1978,14, 69?87.
4. Friedman, H. S. The concept of skill in nonverbal communication: Implications for understanding social interaction. In R. Rosenthal (Ed.)Skill in nonverbal communication. Cambridge, MA: Oelgeschlager, Gunn, & Hain, 1979.
5. Friedman, H. S., Prince, L. M., Riggio, R. E., & DiMatteo, R. Understanding and assessing nonverbal expressiveness: The Affective Communication Test.Journal of Personality and Social Psychology, 1980,39, 333?351.