IT essentials:  PC hardware and software companion guide. 

 - Indianapolis, Indiana:  Cisco Press,  c2011. 
 - xl, 739 pages:  illustrations;  23 cm. 
<br/><br/> Includes glossary and index. 
<br/><br/><label>ISBN: </label>978-981-0696-44-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers
<br/><br/><label>Dewey Class. No.: </label>DC 004.22  / It11