Columbia subject headings:
Harvard subject headings:
Islamic sects--History--Early works to 1800.
Religious life--Islam--Early works to 1800
Sufism--Customs and practices--Early works to 1800.
Sufism--Doctrines--Early works to 1800
Sufism--Early works to 1800
Princeton subject headings:
Islamic sects--History--Early works to 1800.
Religious life--Islam--Early works to 1800.
Sufism--Customs and practices--Early works to 1800.
Sufism--Doctrines--Early works to 1800.
Sufism--Early works to 1800.