Columbia subject headings:
Shiites--Biography.
Shīʻah--History.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.
Harvard subject headings:
Islam--20th century
Islam--Unity
Shīʻah--Relations--Sunnites
Sunnites--Relations--Shīʻah
Princeton subject headings:
Shiites--Biography.
Shīʻah--History.
Shīʻah--Relations--Sunnites.
Sunnites--Relations--Shīʻah.