@inbook{Becker1960,
author = {Becker, G.},
title= {An economic analysis of fertility},
year = {1960},
editor = {Becker, G.S.},
editor = {Duesenberry, J.},
editor = {Okun, B.},
booktitle = {Demographic and economic change in developed countries},
address = {Princeton},
publisher = {Princeton University Press},
pages = {209--231},
series = {NBER conference series 11},
}