1. Banse, R. and Scherer, K.R. (1996). Acoustic profiles in vocal emotion expression. Journal of Personality and Social Psychology, 70, 614–36.
2. Broide, N. (1977). Israeli emblems: a study of one category of communicate nonverbal behavior. Unpublished Master’s Theses, University of Tel Aviv.
3. Darwin, C. (1998). The expression of the emotions in man and animals. 3rd edition. (ed. P. Ekman), Harper Collins, London and Oxford University Press, New York. (Original edition 1872, John Murray, London)
4. Dittman, A.T. (1972). Developmental factors in conversational behavior. Journal of Communication, 22, 404–23.
5. Efron, D. (1968). Gesture and environment. King’s Crown, New York.