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

 - 5th ed 
 - Prentice-Hall, New Delhi  1999 
 - xviii,798p ill. 
<br/><br/><label>ISBN: </label>81-203-1240-6 
<br/><br/><label>Dewey Class. No.: </label>001.64404 Sta