Cisco Networking Academy,  2011- <br/><br/>IT essentials :  pc hardware and software companion guide / Cisco Networking Academy.  - 4th edition  - Indianapolis:  Cisco Press,  ©2011.  - xxxix, 739 pages :  illustrations;  23 cm <br/><br/><label>ISBN: </label>9789810696443 <br/><br/><label>LC Class. No.: </label>TK 7885   / C579 2011