@inbook{Becker1960,
author = {Becker, G.S.},
title= {An economic analysis of fertility},
year = {1960},
editor = {National Bureau of Economic Research},
booktitle = {Demographic and economic change in developed countries. A conference of the universities-national bureau committee for economic research},
address = {Princeton},
publisher = {Princeton University Press},
pages = {209--240},
}