Columbia subject headings:
Church architecture--Syria.
Church architecture--Turkey--Istanbul.
Eastern churches--Liturgy--History.
Harvard subject headings:
Architecture, Byzantine--Syria.
Architecture, Byzantine--Turkey--Istanbul
Liturgy and architecture.
Orthodox Eastern Church--Liturgy.
Orthodox Eastern church buildings--Syria.
Orthodox Eastern church buildings--Turkey--Istanbul.
Princeton subject headings:
Church architecture--Middle East.
Church architecture--Turkey--Istanbul.
Eastern churches--Liturgy--History.
Liturgy and architecture.