Held, Gilbert   <br/><br/>
Understanding data communications 
Gilbert Held 
 - 4th ed. 
 - New Delhi  Prentice-Hall of India Private Limited  1994 
 - xvii, 435p. 
<br/><br/><label>ISBN: </label>9788120310803 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems<br/>Computer networks
<br/><br/><label>Dewey Class. No.: </label>004.6  / H366u4