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

 - 7th ed. 
 - Delhi  Pearson Education  2003 
 - xv, 765p.   
<br/><br/>   
<br/><br/><label>ISBN: </label>81-297-0211-8 
<br/><br/><label>ISSN: </label>
<br/><br/><label>Subjects--Index Terms: </label>Data communications  Digital transmission  Internet  LAN  VAN 
<br/><br/><label>Dewey Class. No.: </label>621.391