Columbia subject headings:
Babism--History.
Iran--Religion--19th century.
Shīʻah--Iran--History.
Harvard subject headings:
Babism--History.
Iran--Religion--19th century.
Shīʻah--Iran--History.
Princeton subject headings:
Babism--History.
Iran--Religion--19th century.
Shīʻah--Iran--History.