Columbia subject headings:
Foreign workers--Persian Gulf Region.
Labor--Persian Gulf Region.
Persian Gulf Region--Emigration and immigration.
Harvard subject headings:
Foreign workers--Persian Gulf States.
Persian Gulf States--Economic conditions.
Persian Gulf States--Politics and government.
Persian Gulf States--Social conditions.
Working class--Persian Gulf States.
Princeton subject headings:
Foreign workers--Persian Gulf region.
Labor--Persian Gulf region.
Persian Gulf Region--Emigration and immigration.