//-->
Grondslagen en techniek van de marktanalyse
Zwan, Arie van ¬der, (1980)
The industrialization of market research - the disintegration of its professional structure : key speech prepared for ESOMAR congress on "Value for money in market and social research", Bristol, September 3rd - 7th 1978
Zwan, Arie van ¬der, (1978)