TY  - CHAP
A1  - Becker, G.S. 
A1  - H.G., Lewis.
T1  - Interaction between quantity and quality of children
Y1  - 1974
A3  - Schultz, T.W.
T2  - Economics of the family: Marriage, children, and human capital
CY  - Cambridge, MA
PB  - National Bureau of Economic Research
SP  - 81
EP  - -90

ER  -