Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986), , Royal Historical Society Guides and Handbooks, No. 2 (3rd ed.), London: Offices of the Royal Historical Society, ISBN 0-86193-106-8
Handbook of British Chronology
Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1984), Maps, Genealogies, Lists: A Companion to Irish History, Part II, New History of Ireland: Volume XI, Oxford: Oxford University Press, 0-19-821745-5
ISBN
Annette Kehnel, Clonmacnois the Church and Lands of St. Ciarán:Change and Continuity in an Irish Monastic Foundation (6th- to 16th Century), 1995, Transaction Publishers, Rutgers – State University, USA. 3-8258-3442-5.