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

 - 7th edition. 
 - New Delhi  :  Pearsion Education,  2003. 
 - xv,765 
<br/><br/><label>ISBN: </label>81-297-0211-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical Electronics Communication,
<br/><br/><label>Dewey Class. No.: </label>621.382  / HEL