_comptia A+ certification essentials students manual  

 - USA:  Thomson,  2006. 
 - xxii, 
<br/><br/><label>ISBN: </label>1423954394 
<br/><br/><label>Subjects--Topical Terms: </label><br/>_operation systems 
<br/><br/><label>LC Class. No.: </label>QA 76.3.M453 2006