Columbia subject headings:
Harvard subject headings:
Europe--Civilization--21st century.
European Union countries--Emigration and immigration--Government policy.
Immigrants--Government policy--European Union countries.
Refugees--Government policy--European Union countries
Princeton subject headings:
Europe--Civilization--21st century.
European Union countries--Emigration and immigration--Government policy.
Immigrants--Government policy--European Union countries.
Refugees--Government policy--European Union countries.