¹⁶Duffy, Seán. "Brian Boru at the Battle of Clontarf: A Medieval Version of 1916?" Irish Times. Web. 09 Apr. 2014. <http://www.irishtimes.com/culture/heritage/brian-boru-at-the-battle-of-clontarf-a-medieval-version-of-1916-1.1667155>.