Roddy, Dennis. <br/><br/>
Electronic communications / 
Dennis Roddy, John Coolen. 
 - 4th  ed. 
 - New Delhi :  Pearson Education,  2008. 
 - xi, 723  p. 
<br/><br/><label>ISBN: </label>8177585582 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.