Columbia subject headings:
Harvard subject headings:
Arab countries--Foreign relations--Iran.
Iran--Foreign relations--Arab countries.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.
Princeton subject headings:
Arab countries--Foreign relations--Iran.
Iran--Foreign relations--Arab countries.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.