Roddy, Dennis <br/><br/>
Electronic communications / 
Dennis Roddy and John Coolen. 
 - 4th ed. 
 - New Jersy :  Prentice Hall,  c1995. 
 - ix, 820 p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>
<br/><br/><label>ISBN: </label>8120309847 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic communication.<br/>Telecommunication systems.
<br/><br/><label>Dewey Class. No.: </label>621.382  / ROE