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

 - 4th edition 
 - Prentice- Hall of India Private Ltd., New Delhi  1994 
 - xvi; 875p 
<br/><br/><label>ISBN: </label>81-203-1019-5 
<br/><br/><label>Dewey Class. No.: </label>001.64404 Sta