Roddy, Dennis <br/><br/>
Electronic communications / Dennis Roddy and John Coolen .- 3rd ed. 

 - London : Prentice Hall Int., c1984. 
 - xii, 788 p. : ill. ; 24 cm.. 
<br/><br/><label>ISBN: </label>0132504405 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.
<br/><br/><label>Dewey Class. No.: </label>621.38 ROD