Neuschwander, Cindy. <br/><br/>
Sir Cumference and the sword in the cone  a math adventure 
Cindy Neuschwander 
 - ed. 
 - [S.l.]  Charlesbridge  2003 
 - 32 p. 
<br/><br/><label>ISBN: </label>0329347810 0329592017 1570916004 (Hardcover) 1570916012 (Softcover)