TY  - BOOK
AU  - Marshall, Alfred
TI  - Principles of economics: An introductory Volume 
U1  - 330 
PY  - 1956///
CY  - London
PB  - MacMillan And Co. Ltd
KW  -  Economics
KW  - Generalizations
KW  - Laws
KW  - Econims studies
ER  -