Columbia subject headings:
Basilians--Italy--Periodicals.
Catholic Church--History--Periodicals.
Monasteries--Italy--Grottaferrata--Periodicals.
Orthodox Eastern Church--History--Periodicals.
Harvard subject headings:
Basilians--Italy--Periodicals.
Catholic Church--History--Periodicals.
Monasteries--Italy--Grottaferrata--Periodicals.
Orthodox Eastern Church--History--Periodicals.
Princeton subject headings:
Catholic Church--History--Periodicals.
Orthodox Eastern Church--History--Periodicals.
Periodicals.