TY  - BOOK
AU  - Heckman, James J
AU  - Leamer, Edward
TI  - Handbook of econometrics, volume 6A
SN  - 9780444506313
U1  - 330.015195 HEC.6A 
PY  - 2007///
CY  - Amsterdam
PB  - North-Holland
KW  - Economics
N1  - Includes Index
ER  -