Columbia subject headings:
Harvard subject headings:
Social structure--Arab countries--History.
Tribal government--Arab countries--History.
Tribes--Arab countries--History.
Princeton subject headings:
Middle East--Ethnic relations--History.
Social structure--Arab countries--History.
Social structure--Middle East--History.
Tribal government--Middle East--History.
Tribes--Arab countries--History.
Tribes--Middle East--History.