Roddy Dennis.  <br/><br/>
Electronic communications 

 - 4th edition. 
 - New Delhi :   Pearson   2011. 
 - 723.  
<br/><br/><label>ISBN: </label>978-81-7756-558-2  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering,
<br/><br/><label>Dewey Class. No.: </label>621.382  / ROD