CompTIA A+ guide to IT technical support 
Andrews, Jean. 
 - 9th ed. 
 -  Cengage Learning,  2017 
 - lxii, 1119 p. 
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<br/><br/><label>ISBN: </label>978-1-30526643-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer technical support.
<br/><br/><label>Dewey Class. No.: </label>004 A565 2017