1. 1. Penland PR: Communication Science and Technology. New York Marcel Dekker Ine 1974.
2. 2. H inde RA: Nonverbal Communication. Cambridge The University Press 1972.
3. 3. Brownell B: The Human Community: Its Philosophy and Practice for a Time ofCrisis. New Yoric Harper and Brothers p 240.
4. 4. Rickelman BL: Bio-psycho-social linguistics. NursRes 1971; 20:398-403.
5. 5. Turner RH: Family Interaction. New York John Wiley and Sons Inc. 1970.