Roddy, Dennis. <br/><br/>
Electronic communications  Book 
Dennis Roddy 
 - 4th ed. 
 - New Delhi :  Prentice Hall of India Ltd.,  c1995 
 - ix, 820 p.  : ill.  ; 26 cm. 
<br/><br/> Includes Index 
<br/><br/><label>ISBN: </label>013312083X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.
<br/><br/><label>Dewey Class. No.: </label>621.382