Dasgupta, Mary Ann , <br/><br/>
Low Cost, No Cost Teaching Aids  Textual Documents 
By Mary Ann Dasgupta 
 - 2nd ed. 
 - Delhi  National book Trust,  2007 
 - pg 145:  23cm. 
<br/><br/><label>ISBN: </label>9788123720548 
<br/><br/><label>Subjects--Index Terms: </label>Education G- Education 
<br/><br/><label>Dewey Class. No.: </label>371.33