Susmita Bala <br/><br/>
Samkaleen sanchar siddhant 
Susmita Bala 
 - Delhi  D P S Publishing         2007 
 - 198p  cm. 
<br/><br/><label>Standard No.: </label>140047 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>4, P7