Columbia subject headings:
Arpa, Enver, 1963-
Sudan--Description and travel.
Sudan--Relations--Turkey.
Sudan--Social life and customs.
Turkey--Relations--Sudan.
Harvard subject headings:
Arpa, Enver, 1963-
Sudan--Description and travel.
Sudan--Relations--Turkey.
Sudan--Social life and customs.
Turkey--Relations--Sudan.
Princeton subject headings:
Arpa, Enver, 1963-
Sudan--Description and travel.
Sudan--Relations--Turkey..
Sudan--Social life and customs.
Turkey--relations--Sudan.