Brown, Peter: , 2. utgave (Oxford: Blackwell Publishing, 2003). Cahill, Thomas: (Anchor, 1996). ISBN 0385418493 Charles-Edwards. T. M.: (Cambridge, 2000). Cróinín, Dáibhí Ó.: (London, 1995). Davies, Wendy: «The Myth of the Celtic Church», i , Oxbow Monograph, no. 16, redigert av Nancy Edwards & Alan Lane, 12-21. (Oxford: Oxbow, 1992). Hughes, Kathleen: «The Celtic Church: Is This a Valid Concept?», , University of Oxford 1975 (utgitt i , 1 (1981), pp. 1–20. Hughes, Kathleen: (London, 1966). Mayr-Harting, Henry: , 3. utgave (London: B. T. Batsford Ltd, 1991). Sharpe, Richard Sharpe: «Some problems concerning the organization of the Church in early medieval Ireland», 3 (1984). Wormald, Patrick: , red. Stephen Baxter (Oxford: Blackwell Publishing, 2006).