TY  - BOOK
AU  - Ashenfelter,Orley
AU  - Heckman,James
TI  - The estimation of income and substitution effects in a model of family labor supply / 
T2  - Princenton University. Working paper ; 
PY  - 1971///
CY  - [New Jersey] : 
PB  - Princenton University, 
KW  - Mano de obra
N1  - Incluye bibliografía
ER  -