@inbook{Becker1974,
author = {Becker, G.S. and Lewis, H.G.},
title= {Interaction between quantity and quality of children},
year = {1974},
editor = {Schultz, T. W.},
booktitle = {Economics of the family: Marriage, children, and human capital},
address = {Chicago},
publisher = {University of Chicago Press},
pages = {81‒90},
}