@techreport{Beets2001,
author = {Beets, G. and Dourleijn, E. and Liefbroer, A. and Henkens, K.},
title= {De timing van het eerste kind in Nederland en Europa},
year = {2001},
publisher = {NIDI},
address = {Den Haag},
number = {Raport No. 59},
}