Vecchione, Glen. <br/><br/>
Challenging math puzzle. / 
Glen Vecchione illustrated by Glen Vecchione & Nina Zottoli. 
 - New Delhi :  Goodwill Publishing House,  [s.d] 
 - 96p. : ill 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations