↑(en) T.W Moody, F.X. Martin, F.J. Byrne, A New History of Ireland IX Maps, Genealogies, Lists. A companion to Irish History part II, Oxford, Oxford University Press, , 690 p. (ISBN978-0-19-959306-4), p. 235Lower Mac William and Viscounts of Mayo, 1332-1649
↑(en) T.W Moody, F.X. Martin, F.J. Byrne, A New History of Ireland IX Maps, Genealogies, Lists. A companion to Irish History part II, Oxford, Oxford University Press, , 690 p. (ISBN978-0-19-959306-4), p. 171 Mac William Burkes: Mac William Iochtar (de Burgh) Lords of Lower Connacht and Viscounts of Mayo 13332-1649. Genealogical Table n°39.
↑ (en) Martin J. Black Journal of the Galway Archeological and Historical Society Vol VII n°1 « Notes on the Persons Named in the Obituary Book of the Franciscan Abbey at Galway » 1-28.
Sources
(en) T.W Moody, F.X. Martin, F.J. Byrne A New History of Ireland , Volume IX Maps, Genealogies, Lists. A companion to Irish History part II . Oxford University Press réédition 2011 (ISBN9780199593064).
(en) Martin J. Black Journal of the Galway Archeological and Historical Society Vol VII n°1 « Notes on the Persons Named in the Obituary Book of the Franciscan Abbey at Galway » 1-28.