Cioara, Jeremy. <br/><br/>
CCNA voice 640-461 official cert guide / 
Jeremy Cioara. 
 - New Delhi :  Dorling Kindersley,  2012. 
 - xxvii,498 p. ;  (R 15 SH 3) 
<br/><br/> New. 
<br/><br/><label>ISBN: </label>8131786811 (paperback) 9788131786819 (paperback) 
<br/><br/><label>Source: </label> Allied Book  PKR 525.50 
<br/><br/><label>Dewey Class. No.: </label>004.695076