Essentials of computers :  visual guide / 
Jemma Development Group. 
 - 4th ed. 
 - Philippines :  Jemma,  2014. 
 - 270 p. : 26 cm. 
<br/><br/> Includes bibliography. 
<br/><br/><label>ISBN: </label>978-971-37-0443-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers<br/>Electronic data processing