van der Gaag, N. (1999). National and regional population trends in the European Union: Nicole van der Gaag .. European Commission.
Chicago-Zitierstil (17. Ausg.)van der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. Luxembourg: European Commission, 1999.
MLA-Zitierstil (8. Ausg.)van der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. European Commission, 1999.
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