TY  - BOOK
AU  - Williams, K R
AU  - Williams,K R
TI  - Natural Calculator:  Using the Natural Process of the Mind for Mental Calculation
SN  - 8120819624   
U1  - S12 
PY  - 2003///
CY  - Delhi
PB  - Motilal Banarsidass Publishers Pvt Ltd
N1  - includes index and biblioraphy
ER  -