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Baring-Gould, Sabine (1898). "The Celtic Church and its Saints". The Lives of the Saints. 16. New York: Longmans, Green, & Co.
Bradley, Ian (1999). Celtic Christianity: Making Myths and Chasing Dreams. Edinburgh University Press. ISBN 0-7486-1047-2. Diakses tanggal 9 May 2013.
Brown, Peter (2003). The Rise of Western Christendom: Triumph and Diversity (edisi ke-2nd). Oxford: Blackwell Publishing.
Charles-Edwards, T.M. (2000). Early Christian Ireland. Cambridge.
Corning, Caitlin (2006). The Celtic and Roman Traditions: Conflict and Consensus in the Early Medieval Church. Palgrave Macmillan. ISBN 1-4039-7299-0.
Ó Cróinín, Dáibhí (1995). Early Medieval Ireland: 400–1200. London.
Davies, Wendy (1992). "The Myth of the Celtic Church".  Dalam Edwards, Nancy; Lane, Alan. The Early Church in Wales and the West. Oxbow Monograph. 16. Oxford: Oxbow. hlm. 12–21.
Flechner, Roy; Meeder, Sven, ed. (2016). The Irish in Early Medieval Europe: Identity, Culture and Religion. London: Palgrave Macmillan. ISBN 9781137430595.
Herren, Michael W.; Brown, Shirley Ann (2002). Christ in Celtic Christianity. Woodbridge: Boydell Press. ISBN 0-85115-889-7.
Hughes, Kathleen (1981). The Celtic Church: Is This a Valid Concept? O'Donnell lectures in Celtic Studies, University of Oxford 1975. Cambridge Medieval Celtic Studies. 1. hlm. 1–20.
Hughes, Kathleen (1966). The Church in Early Irish Society. London: Methuen. ISBN 1-59740-067-X. OCLC 711797907.
Hughes, Kathleen (2005). "The Church in Early Irish Society: 400–800".  Dalam Ó Cróinín, Dáibhí. A New History of Ireland: Prehistoric and Early Ireland. Oxford University Press. ISBN 978-0-19-922665-8.  Google Books link 2
John, Eric (2000). "The Social and Political Problems of the Early English Church".  Dalam Pelteret, David A. E. Anglo-Saxon History: Basic Readings. New York: Garland Publishing.
Koch, John T. (2006). Celtic Culture: A Historical Encyclopedia. ABC-CLIO.
Lloyd, John Edward (1912). A History of Wales from the Earliest Times to the Edwardian Conquest. Longmans, Green, and Co. Diakses tanggal 17 May 2010.
McCarthy, Daniel (2003). "On the Shape of the Insular Tonsure" (PDF). Celtica. 24: 140–167. Diarsipkan dari versi asli (PDF) tanggal 2009-03-26. Diakses tanggal 18 June 2009.
Meeder, Sven (2011). "Boniface and the Irish Heresy of Clemens". Church History. 80: 251–80. Diakses tanggal 1 August 2016.
Nordenfalk, Carl (1977). Celtic and Anglo-Saxon Painting: Book illumination in the British Isles 600–800. New York: George Braziller.
Pächt, Otto (1986). Book Illumination in the Middle Ages. London: Harvey Miller Publishers. ISBN 0-19-921060-8.  (trans fr German)
Ryan, John (1931). Irish Monasticism, Origins and Early Development. Dublin: Talbot Press.
Sharpe, Richard (1984). "Some problems concerning the organisation of the Church in early medieval Ireland". Peritia. 3: 230–70.
Stancliffe, Clare (1992). "Columbanus and the Gallic Bishops".  Dalam Constable, G.; Rouche, M. Mélanges offerts au Professeur Oliver Guillot. Paris. hlm. 205–14.
Wormald, Patrick (2006). "Bede and the 'Church of the English'".  Dalam Baxter, Stephen. The Times of Bede: Studies in Early English Christian Society and its Historian. Oxford: Blackwell Publishing.
Yorke, Barbara (2006). The Conversion of Britain: Religion, Politics and Society in Britain c. 600–800. London: Pearson/Longman. ISBN 0-582-77292-3.
Youngs, Susan, ed. (1989). 'The Work of Angels', Masterpieces of Celtic Metalwork, 6th–9th centuries AD. London: British Museum Press. ISBN 0-7141-0554-6.