Columbia subject headings:
Islamic sects--Early works to 1800.
Philosophy, Ancient--Early works to 1800.
Philosophy, Arab--Early works to 1800.
Religions--Early works to 1800.
Harvard subject headings:
Islamic sects--Early works to 1800.
Philosophy, Ancient--Early works to 1800.
Philosophy, Arab--Early works to 1800.
Religions--Early works to 1800
Princeton subject headings:
Islamic sects--Early works to 1800.
Philosophy, Ancient--Early works to 1800.
Philosophy, Arab--Early works to 1800.
Religions--Early works to 1800.