Columbia subject headings:
Harvard subject headings:
Foreign workers, European--European Union countries.
Freedom of movement--Economic aspects--European Union countries.
Labor market--European Union countries.
Labor mobility--European Union countries.
Labor policy--European Union countries
Migration, Internal--European Union countries.
Princeton subject headings:
Freedom of movement--Economic aspects--European Union countries.
Labor market--European Union countries.
Labor mobility--European Union countries.
Migration, Internal--European Union countries.