Columbia subject headings:
Harvard subject headings:
Citizenship--European Union countries
Citizenship--European Union countries--Congresses.
European Union countries--Emigration and immigration--Government policy.
Naturalization--European Union countries--Congresses.
Naturalization--European Union countries.
Noncitizens--European Union countries
Noncitizens--European Union countries--Congresses.
Princeton subject headings:
Citizenship--European Union countries--Congresses.
European Union countries--Emigration and immigration--Government policy--Congresses.
Naturalization--European Union countries--Congresses.
Noncitizens--European Union countries--Congresses.