Cita APA (7th ed.)

van der Gaag, N. (1999). National and regional population trends in the European Union: Nicole van der Gaag .. European Commission.

Cita Chicago (17th ed.)

van der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. Luxembourg: European Commission, 1999.

Cita MLA (8th ed.)

van der Gaag, Nicole. National and Regional Population Trends in the European Union: Nicole Van Der Gaag .. European Commission, 1999.