Wilf's Shapes 
Wilfs Shapes 
 -  30 p. : chiefly col. ill. ; 18 cm. 
 - New York  Oxford University Press  2009 
<br/><br/><label>ISBN: </label>9780198387435 
<br/><br/><label>Dewey Class. No.: </label>372.677049 YOU  / 2.372.677049YOU