Roddy Dennis <br/><br/>
Electronic communications. 
Roddy Dennis; Coolen John 
 - 3 
 - New Delhi  Prentice-Hall        1984 
 - xii,788p.  cm. 
<br/><br/><label>Standard No.: </label>99457 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,4, M4