Columbia subject headings:
Citizenship--European Union countries.
Domicile--European Union countries.
Foreign workers--Legal status, laws, etc.--European Union countries.
Freedom of movement--European Union countries.
Social rights--European Union countries.
Harvard subject headings:
Citizenship--European Union countries
Emigration and immigration law--European Union countries.
Freedom of movement--European Union countries
Princeton subject headings:
Citizenship--European Union countries.
Domicile--European Union countries.
Foreign workers--Legal status, laws, etc.--European Union countries.
Freedom of movement--European Union countries.
Social rights--European Union countries.