Khurana, KJS. <br/><br/>
Maths 30 Days Wonder 
Khurana KJS, Markanday R 
 - New Delhi :  S. Chand & Company Ltd,  c2010. 
 - 603 p.:  ill.; 
<br/><br/><label>ISBN: </label>8121933515 
<br/><br/><label>Dewey Class. No.: </label>510  / KJS/MAT