TY  - BOOK
AU  - Angrist Joshua D
AU  -  Pischke Jorn-Steffen
TI  - Mostly harmless econometrics : An empiricist's companion
U1  - X:(B), P9 
PY  - 2009///
CY  - New Jersey 
PB  - Princeton University Press    
KW  - Buisness Economics
ER  -