^Moody, T. W.; Martin, F. X., eds. (1967). The Course of Irish History. Cork: Mercier Press. p. 370.
^Ellis, Steven G. (2004). "Fitzgerald, Gerald, eighth earl of Kildare (1456?–1513)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/9554. Retrieved 8 March 2012. (subscription or UK public library membership required)