Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., èd. (1986). Handbook of British Chronology (édhisi ka-3rd, reprinted 2003). Cambridge: Cambridge University Press. ISBN0-521-56350-X.
Moody, T. W.; Martin, F. X.; Byrne, F. J., èd. (1984). Maps, Genealogies, Lists: A Companion to Irish History, Part II. A New History of Ireland. Vol. IX. Oxford: Oxford University Press. ISBN0-19-821745-5.
Bacaan tambahan
Devaney, Rev. Owen, Ardagh and Clonmacnois: Footsteps of Mel and Ciarán, Booklink, 2005.