ESE <br/><br/>
ESE 2019 Information & communication technology Paper-I 

 - 3rd (ed.) 
 - New Delhi  IES Master pub  2018 
 - 257 
<br/><br/><label>ISBN: </label>9789386383655 
<br/><br/><label>Standard No.: </label>119379 
<br/><br/><label>Dewey Class. No.: </label>621.382  / INF