Columbia subject headings:
Harvard subject headings:
Baptism--History--Early church, ca. 30-600
Confirmation
Initiation rites--Religious aspects--Christianity
Princeton subject headings:
Baptism--History--Early church, ca. 30-600.
Catechetics--History--Early church, ca. 30-600.
Catechumens--History--Early church, ca. 30-600.
Confirmation (Liturgy)--History.
Fathers of the church.
Initiation rites--Religious aspects--Christianity.