Columbia subject headings:
Apologetics--Early works to 1800.
Apologetics--History--Middle Ages, 600-1500.
Christianity and other religions--Islam--Early works to 1800.
Christianity--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Harvard subject headings:
Apologetics--Early works to 1800
Apologetics--History--Middle Ages, 600-1500
Christianity and other religions--Islam--Early works to 1800.
Christianity--Early works to 1800
Islam--Relations to Christianity--Early works to 1800.
Orthodox Eastern Church--Controversial literature.
Princeton subject headings: