Roddy, Dennis <br/><br/>
Electronic communications / 
Dennis Roddy and  John Coolen. 
 - 2nd ed. 
 - New Delhi :  Prentice-Hall of india private limited.,  1980 [printing 1983]. 
 - xii, 628 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0876921683  $27.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.--Electronic communication
<br/><br/><label>Dewey Class. No.: </label>621.382  / ROE 1983