Columbia subject headings:
Foreign workers--Germany--Congresses.
Germans--Ethnic identity--Congresses.
Turks--Ethnic identity--Congresses.
Turks--Germany--Congresses.
Harvard subject headings:
Foreign workers--Germany--Congresses.
Germans--Ethnic identity--Congresses.
Turks--Ethnic identity--Congresses.
Turks--Germany--Congresses.
Princeton subject headings:
Foreign workers--Germany--Congresses.
Germans--Ethnic identity--Congresses.
Turks--Ethnic identity--Congresses.
Turks--Germany--Congresses.