TY  - BOOK
AU  - Heckman James J. Ed.
AU  -  Singer Burton Ed.
TI  - Longitudinal analysis of labor market data
U1  - X:991:(B), M5 
PY  - 1985///
CY  - Cambridge
PB  - Cambridge University Press        
KW  - Labour Market Economics
N1  - Econometric Society Monographs, 10
ER  -