Columbia subject headings:
Bible. New Testament--Criticism, interpretation, etc.
Christian union--Biblical teaching.
Church--Biblical teaching.
Harvard subject headings:
Bible. New Testament--Criticism, interpretation, etc.
Ecumenical movement--Biblical teaching.
Theology.
Princeton subject headings:
Bible. New Testament--Criticism, interpretation, etc.
Church--History of doctrines--Early church, ca. 30-600.
Ecumenical movement.
Lord's Supper and Christian union.