Columbia subject headings:
Islam--Doctrines.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.
Harvard subject headings:
Islamic law.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.
Princeton subject headings:
Islam--Doctrines.
Islamic law.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.
Sunnites--Relatons Shīʻah.