TY  - BOOK
AU  - Porwal,L.S.
AU  - Porwal,L.S.
AU  - Saxena,R.G.
TI  - According: a textbook for class XI 
U1  - 657 
PY  - 1989///
CY  - New Delhi
PB  - NCERT
KW  - Economics
KW  - Study and teaching
KW  - India
ER  -