Columbia subject headings:
Baptism--History--Early church, ca. 30-600.
Catechetics--History--Early church, ca. 30-600.
Harvard subject headings:
Baptism--History of doctrines--Early church, ca. 30-600.
Baptism--History--Early church, ca. 30-600
Catechisms--History of doctrines--Early church, ca. 30-600.
Initiation rites--Religious aspects--Christianity--History--Early church, ca. 30-600.
Princeton subject headings: