@article{De Graaf2000,
author = {De Graaf, N.D. and De Graaf, P.M. and Kraaykamp, G. and Ultee, W.C.},
title= {Sectie Sociologie, Katholieke Universiteit Nijmegen, Familie-enquête Nederlandse bevolking 2000; Family survey Dutch population 2000},
year = {2000},
}