Columbia subject headings:
Harvard subject headings:
Orthodox Eastern Church--Doctrines.
Orthodox Eastern Church--Liturgy.
Orthodoxos Ekklēsia tēs Hellados--Doctrines.
Orthodoxos Ekklēsia tēs Hellados--Liturgy.
Princeton subject headings:
Orthodox Eastern Church--Doctrines.
Orthodox Eastern Church--Liturgy.
Orthodoxos Ekklēsia tēs Hellados--Doctrines.
Orthodoxos Ekklēsia tēs Hellados--Liturgy.