RITCHIE, L.David <br/><br/>
Communication concepts 2: information / 
[by] L.David Ritchie 
 - London  Sage pub.  1991 
 - 75 p. 
<br/><br/> Includes references and index. 
<br/><br/><label>ISBN: </label>803939043 
<br/><br/><label>Dewey Class. No.: </label>10.78  / RIT