Columbia subject headings:
Harvard subject headings:
Citizenship--European Union countries
European Union countries--Emigration and immigration--Government policy.
Immigrants--Civil rights--European Union countries.
Noncitizens--Civil rights--European Union countries.
Princeton subject headings:
Citizenship--European Union countries.
European Union countries--Emigration and immigration--Government policy.
Immigrants--Civil rights--European Union countries.
Noncitizens--Civil rights--European Union countries.