^Johnston, "Munster, saints of (act. c.450–c.700)."
^Gratton-Flood, W.H. (March 1, 1907), "The Twelve Apostles of Erin", The Catholic Encyclopedia, New York: Robert Appleton Company, I, diakses tanggal 2008-02-09
Johnston, Elva. "Munster, saints of (act. c.450–c.700)." Oxford Dictionary of National Biography. Oxford University Press, Sept 2004, online edition May 2008. Accessed: 14 Dec 2008.