Hopper, Robert <br/><br/>
Human message systems 
Robert Hopper illustrated by Cesc 
 - New York  Harper & Row  1976 
 - 332 p. : ill. ; 24 cm. 
<br/><br/> Includes indexes 
<br/><br/><label>ISBN: </label>006042902X 
<br/><br/><label>LCCN: </label>75-34458 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication