Columbia subject headings:
Social integration--Europe--Congresses.
Sociology--Europe--Congresses.
Harvard subject headings:
Social integration--Europe--Congresses.
Sociology--Europe--Congresses.
Princeton subject headings:
Europe--Politics and government--21st century--Congresses.
European Union countries--Social conditions--Congresses.
Social integration--Europe--Congresses.
Sociology--Europe--Congresses.