Columbia subject headings:
Kufr (Islam)--Early works to 1800.
Sin--Islam--Early works to 1800.
Harvard subject headings:
Kufr (Islam)--Early works to 1800.
Sin--Islam--Early works to 1800.
Princeton subject headings:
Kufr (Islam)--Early works to 1800.
Sin--Islam--Early works to 1800.