Kawashima, Ryūta, <br/><br/>
Train your brain / 
Ryūta Kawashima 
 - 205 pages :  illustrations (some color) ;  20 cm. 
<br/><br/><label>ISBN: </label>9780141325699 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental discipline<br/>Mental arithmetic