Ravindra Kumar <br/><br/>
Khel evam manoranjan dvara ganitha jnan (h) 

 -  Arya Book Depot, New Delhi  1979 
 - 64 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>H 510  RAV-K