References
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "article=Agios O Theos". Catholic Encyclopedia. Robert Appleton Company.
This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "article=Improperia". Catholic Encyclopedia. Robert Appleton Company.
- Liber Usualis Missae et Officii: Paris n.d.
- Parry, Ken; David Melling (editors) (1999). The Blackwell Dictionary of Eastern Christianity. Malden, Massachusetts.: Blackwell Publishing. ISBN 0-631-23203-6.
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