Stallings, William <br/><br/>
Data and computer communications 

 - 5th edition 
 - Prentice -Hall International, Inc, New Jersey  1997 
 - xviii; 798p 
<br/><br/><label>ISBN: </label>0-13-571274-2 
<br/><br/><label>Dewey Class. No.: </label>001.64404 Sta