Columbia subject headings:
Constantinople (Ecumenical patriarchate)
Orthodox Eastern Church--Doctrines.
Orthodox Eastern Church--Government.
Harvard subject headings:
Constantinople (Ecumenical patriarchate)
Orthodox Eastern Church--Doctrinal and controversial works--Orthodox Eastern authors.
Princeton subject headings:
Constantinople (Ecumenical patriarchate)
Councils and synods, Ecumenical.
Orthodox Eastern Church--Doctrines.