Held, Gilbert. <br/><br/>
Understanding data communications. 

 - 4 
 - New Delhi  Prentice Hall of India PVt Ltd  1996 
 - xvii,431 
<br/><br/><label>ISBN: </label>8120310802 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer Networks
<br/><br/><label>Dewey Class. No.: </label>004.65 HELG