TY  - BOOK
AU  - Heckman, James J
AU  - Singer, Burton S
TI  - Longitudinal analysis of labor market data
SN  - 9780521088183
U1  - 331.1201 ;HEC 
PY  - 2008///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Economics
N1  - Includes index
ER  -