Roddy, Dennis. Coolen, John <br/><br/>
Electronic communications 

 - 4th ed.  
 -  New Delhi : PHI,  1995 
 - ix+820 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communications
<br/><br/><label>Dewey Class. No.: </label>621.380413   ROD;6