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

 - 6th ed. 
 - New Delhi  Techmedia  1999 
 - xii,620 p. 
<br/><br/><label>ISBN: </label>8176353191 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COMPUTER SCIENCE
<br/><br/><label>Universal Decimal Class. No.: </label>004.7  / HEL