Comer, Douglas E. <br/><br/>
Computer networks and internets  
Douglas E. Comer. 
 - 3rd. ed. 
 - London  Prentice Hall  2001. 
 - 683 p.  24 cm. 
<br/><br/><label>ISBN: </label>8129703300 (paperback) 9788129703309 (paperback) 
<br/><br/><label>Source: </label> 00.00 PKR