Columbia subject headings:
Apologetics--Early works to 1800.
Byzantine Empire--History--Michael III, 842-867--Sources.
Christianity and other religions--Islam--Early works to 1800.
Islam--Controversial literature--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Islam--Relations--Orthodox Eastern Church--Sources.
Orthodox Eastern Church--Relations--Islam--Sources.
Harvard subject headings:
Apologetics--Early works to 1800
Byzantine Empire--History--Michael III, 842-867--Sources.
Christianity and other religions--Islam--Early works to 1800
Islam--Controversial literature--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800
Islam--Relations--Orthodox Eastern Church--Sources.
Orthodox Eastern Church--Relations--Islam--Sources.
Princeton subject headings:
Apologetics--Early works to 1800.
Byzantine Empire--History--527-1081--Sources.
Christianity and other religions--Islam--Early works to 1800.
Islam--Controversial literature--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Islam--Relations--Orthodox Eastern Church--Sources.
Orthodox Eastern Church--Relations--Islam--Sources.