Roddy Dennis <br/><br/>
Electronic communications 
Roddy Dennis; Collen John 
 - 3 
 - New York       Prentice Hall         1987 
 - xii, 788p.  cm. 
<br/><br/><label>Standard No.: </label>31024 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,4, M7-;3-;3