Roddy, D. <br/><br/>
Electronic communications / 
by Dennis Roddy, John Coolen. 
 - 4th ed. 
 - Englewood Cliffs, NJ :  Prentice Hall,  1995. 
 - ix, 820 p 
<br/><br/><label>ISBN: </label>013312083X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.