Columbia subject headings:
Harvard subject headings:
Friendship--Religious aspects--Islam--Early works to 1800.
Islamic ethics--Early works to 1800.
Muslims--Conduct of life--Early works to 1800
Princeton subject headings:
Islamic ethics--Early works to 1800.
Muslims--Conduct of life--Early works to 1800.
Quakers--Religious aspects--Islam--Early works to 1800.