TY  - BOOK
AU  - Gupta, B. S
AU  - Bhushan, S
TI  - Calculation techniques faster than computer: (for all competetive exam and school student) 
SN  - 9788189812331
U1  - 511.2078 
PY  - 2010///
CY  - Delhi
PB  - S. S. Publications
ER  -