^Whitley Stokes, Lives of Saints from the Book of Lismore (1890), p. xv (preface).
^"Fasti ecclesiae Hibernicae : the succession of the prelates and members of the Cathedral bodies of Ireland" Vol 4 p97 Cotton, H: Dublin : James Charles & Son, 1878
^Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1986). Handbook of British Chronology (3rd ed.). Cambridge: Cambridge University Press. pp. 395–396. ISBN0-521-56350-X.