Columbia subject headings:
Christianity--Controversial literature.
Islam--Apologetic works.
Harvard subject headings:
Christianity--Controversial literature
Islam--Apologetic works
Princeton subject headings:
Christianity and other religions--Islam--Early works to 1800.
Christianity--Controversial literature--Early works to 1800.
Islam--Apologetic works--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.