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^Mac Annaidh, Séamas, ed. (2001). Illustrated Dictionary of Irish History. Dublin: Gill and Macmillan. ISBN 0717135365.
^Simms, Katherine (2000). "Late Medieval Tír Eoghain: The Kingdom of 'the Great Ó Néill'". In Dillon, Charles; Jeffries, Henry A. (eds.). Tyrone: History & Society. Dublin: Geography Publications. ISBN 0-906602-71-8.