Roddy, Dennis <br/><br/>
Electronic communications 
Dennis Roddy and John Coolen 
 - 4th ed. 
 - New Delhi:  Prentice-Hall,   1997. 
 -  ix, 820p. 
<br/><br/> PB 
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>8120309847 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communication
<br/><br/><label>Dewey Class. No.: </label>621.382  / ROE