Held, Gilbert. , <br/><br/>
Data communications networking devices :  operation, utilization and LAN and WAN internetworking / 
Gilbert Held. 
 - 4th ed. 
<br/><br/><label>ISBN: </label>047197515X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks.<br/>Data transmission systems.
<br/><br/><label>LC Class. No.: </label>TK5105.5   / .H44 1999