Columbia subject headings:
Iran--Relations--Persian Gulf Region.
Persian Gulf Region--Relations--Iran.
Persian Gulf Region--Relations--Qatar.
Qatar--Relations--Persian Gulf Region.
Harvard subject headings:
Iran--Relations--Persian Gulf Region.
Persian Gulf Region--Relations--Iran.
Persian Gulf Region--Relations--Qatar.
Qatar--Relations--Persian Gulf Region.
Princeton subject headings:
Iran--Relations--Persian Gulf Region.
Persian Gulf Region--Relations--Iran.
Persian Gulf Region--Relations--Qatar.
Qatar--Relations--Persian Gulf Region.