@inbook{Willekens2009,
author = {Willekens, F.},
title= {Family and household demography},
year = {2009},
doi = {10.1016/B978-0-08-097086-8.31016-9},
editor = {Zeng, Y.},
booktitle = {Encyclopedia of Life Support Systems (EOLSS): Demography},
publisher = {EOLLS Publishers},
}