Roddy, Dennis <br/><br/>
Electronic communications 
Dennis Roddy 
 - 4th ed. 
 - New Delhi  Prentice-Hall of India  1995 
 - ix, 820p. 
<br/><br/><label>ISBN: </label>9788120309845 
<br/><br/><label>Dewey Class. No.: </label>621.382 R613E-4