van der Gaag, N. (1999). National and regional population trends in the European Union: Nicole van der Gaag .. European Commission.
Chicago Style (17th ed.) Citationvan der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. Luxembourg: European Commission, 1999.
MLA (8th ed.) Citationvan der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. European Commission, 1999.
Warning: These citations may not always be 100% accurate.