Roddy, Dennis. <br/><br/>
Electronic communications / 
Dennis Roddy and John Coolen. 
 - 4th ed. 
 - New Delhi :  Pearson/Prentice Hall ,  c1999. 
 - ix, 820 pages :  illustrations ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>8120309847 9788120309845 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.
<br/><br/><label>Dewey Class. No.: </label>621.382 ROD