Columbia subject headings:
Harvard subject headings:
Catholic Church. Sacramentary--History and criticism.
Liturgies, Early Christian.
Orthodox Eastern Church. Euchologion--History and criticism.
Sacramentaries--Texts.
Serapion, of Thmuis, Saint--Criticism and interpretation.
Princeton subject headings:
Christian literature, Early--History and criticism.
Serapion, of Thmuis, Saint