Columbia subject headings:
Cooperation--Law and legislation--European Union countries.
Public policy (Law)--European Union countries.
Sociological jurisprudence--European Union countries.
Solidarity--European Union countries.
Harvard subject headings:
Cooperation--Law and legislation--European Union countries.
Public policy (Law)--European Union countries.
Sociological jurisprudence--European Union countries.
Solidarity--European Union countries.
Princeton subject headings:
Cooperation--Law and legislation--European Union countries.
Public policy (Law)--European Union countries.
Sociological jurisprudence--European Union countries.
Solidarity--European Union countries.