Columbia subject headings:
Foreign workers--Germany (West)--Social conditions.
Germany (West)--Emigration and immigration.
Turks--Germany (West)--Social conditions.
Harvard subject headings:
Foreign workers--Germany (West)--Social conditions.
Germany (West)--Emigration and immigration.
Turks--Germany (West)--Social conditions.
Princeton subject headings:
Foreign workers--Germany (West)
Germany (West)--Emigration and immigration.
Turkey--Emigration and immigration.