@article{De Graaf1996,
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 1998; Family Survey Dutch Population 1998},
year = {1996},
}