Columbia subject headings:
Islam--Customs and practices--Early works to 1800.
Islam--Relations--Early works to 1800.
Islamic heresies--Early works to 1800.
Harvard subject headings:
Islam--Customs and practices--Early works to 1800
Islam--Relations--Early works to 1800.
Islamic heresies--Early works to 1800.
Princeton subject headings:
Islam--Customs and practices--Early works to 1800.
Islam--Relations--Early works to 1800.
Islamic heresies--Early works to 1800.