Ganzeboom, H. B. G. and Treiman, D. J. (2009). "International  Stratification and Mobility File" Available from  <http://home.fsw.vu.nl/hbg.ganzeboom/ISMF/index.htm> [accessed 7  September 2009].
Maarten L. Buis (2012) "The Composition of Family Background:  The Influence of the Economic and Cultural Resources of both Parents on  the Offspring's Educational Attainment in the Netherlands between 1939  and 1991" European Sociological Review.
Scale of education is documented in Chapter 3 of       Buis, M. L. (2010). Inequality of Educational Outcome and Inequality   of Educational Opportunity in the Netherlands during the 20th Century. PhD thesis, Faculty of Social Sciences, VU-University Amsterdam.
Scale of education is documented in Chapter 3 of        Buis, M. L. (2010). Inequality of Educational Outcome and Inequality   of Educational Opportunity in the Netherlands during the 20th Century. PhD thesis, Faculty of Social Sciences, VU-University Amsterdam.
International Socio Economic Index is documented in:      Ganzeboom, H. B. G. and Treiman, D. J. (2003). Three internationally   standardized measures for comparative research onoccupational status.  In Hoffmeyer-Zlotnik, J. H. and Wolf, C. (Eds.), Advances in           Cross-National Comparison: A European Working Book for Demographic and Socio-Economic variables. New York: Kluwer Academic Press, pp. 159–193.