Roddy, Dennis,  1931- <br/><br/>
Electronic communications  [Book] / 
by Dennis Roddy, John Coolen. 
 - 4th ed. 
 - New Delhi :  Prentice \Hall of India,  c1995. 
 - ix, 820 p. :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/> All. 
<br/><br/><label>ISBN: </label>8120309847 (hbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.
<br/><br/><label>Dewey Class. No.: </label>621.382