Columbia subject headings:
Emigration and immigration--Research--Methodology.
Emigration and immigration--Research.
Germany--Emigration and immigration.
Morocco--Emigration and immigration.
Poland--Emigration and immigration.
Turkey--Emigration and immigration.
Harvard subject headings:
Emigration and immigration--Research--Methodology.
Emigration and immigration--Research.
Germany--Emigration and immigration.
Morocco--Emigration and immigration.
Poland--Emigration and immigration
Turkey--Emigration and immigration.
Princeton subject headings:
Emigration and immigration.