Forouzan, Behrouz A and Fegan, Sophia Chung. <br/><br/>
Data Communications and networking / 

 - 4th ed. 
 - New Delhi,  Tata McGraw Hill,  c2006. 
 - 1134p. ;  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9780070634145 
<br/><br/><label>Dewey Class. No.: </label>004.6