Roddy, Dannis & Coolen, John <br/><br/>
Electronic communications 

 - 4th ed 
 - New Delhi  Prentice Hall of India  1995 
 - x,820  Pb 
<br/><br/><label>ISBN: </label>81-203-0984-7 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>621.38