^Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1986). Handbook of British Chronology (Third Edition ed.). Cambridge: Cambridge University Press. p. 342. ISBN0-521-56350-X.
^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. ISBN0-19-821745-5.