Rao, A.R <br/><br/>
Brain sharpeners 
A.R. Rao 
 - 4 rev. & enl. 
 - Ahmedabad  Vikram A Sarabhai Community Science Centre  2011 
 - 253 
<br/><br/><label>ISBN: </label>9789380580067 
<br/><br/><label>Dewey Class. No.: </label>153  / RAO