TY  - BOOK
AU  - Kawashima,Ryuta
TI  - Train your brain: 60 days to a better brain 
SN  - 9780141034881
PY  - 2008///
CY  - London
PB  - Penguin Books
KW  - Mental work
KW  - Memory
KW  - Problems, exercises, etc
KW  - Arithmetic
N1  - Copyright Ryuta Kawashima/Kumon Publishing Co. Ltd, 2005
ER  -