1. Ahlburg, D. and De Vita, C. J., 1992. ‘New Realities of the American Family’.Population Bulletin 47(2), Population Reference Bureau, Washington D.C.
2. Boh, K., 1989. ‘European Family Life Patterns — A Reappraisal’, in: K. Boh et al. (eds), Changing Patterns of European Family Life: A Comparative Analysis of 14 European Countries, Routledge, London and New York: 265–298.
3. Bosveld, W., Wijsen, C. and Kuijsten, A., 1991. ‘The growing importance of fertility at higher ages in The Netherlands’. Paper prepared for the European Population Conference 1991, organized by EAPS/IUSSP/INED, Paris, October 21–25. Postdoctorale Onderzoekersopleiding Demografie, Amsterdam (PDOD-Paper No. 3).
4. Calot, G., 1990. ‘La fécondité en Europe: Evolutions passées et perspectives d'avenir’.Bevolking en Gezin 19: 56–82.
5. Cheal, D., 1991. Family and the State of Theory. Harvester/Wheatsheaf, New York.