@inbook{Billari2009,
author = {Billari, F.C.},
title= {The happiness commonality: Fertility decisions in low-fertility settings},
year = {2009},
editor = {United Nations},
booktitle = {How generations and gender shape demographic change: Towards policies based on better knowledge: Conference proceedings},
address = {New York},
publisher = {United Nations},
pages = {7--38},
}