Severin W J <br/><br/>
Communication theories 
Severin W J; Tankard J W 
 - 2 
 - New York  New York, Longman  1988 
 - 362p 
<br/><br/><label>ISBN: </label>0-582-28574-7 
<br/><br/><label>Source: </label>Textbook