1
theoretische en empirische modellen = (Ethnocentrism in the Netherlands)
2
documentation of social background variables of 1067 national surveys conducted by NIPO from 1962 to 1992
3
evidence from artificial neural networks
4
documentation of national surveys on religious and secular attitudes in 1979, 1985 and 1990
1992
5
documentation of a national survey on religious and secular attitudes in 1990
1992
6
documentation of a national survey on religious and secular attitudes and behaviour in 2011 - 2012
2012