Williams, Frederick <br/><br/>
The new communications / 
Frederick Williams 
 - 3 
 - Belmont :  Wadsworth Publishing,  1992       
 - xvi, 407 p. 
<br/><br/><label>ISBN: </label>0534154689 
<br/><br/><label>LC Class. No.: </label>P 90 W723n 1992