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Shane O'Neill, by Ciaran Brady, pg. 22–51. Dundalgan Press, Dundalk, Ireland 1996

Royal O'Neill, Desmond O'Neill, 1996.

Phelim (Felix) O'Neill's Genealogy in a Portuguese Genealogical site

Puerto Rico : Desde sus origenes hasta el cese de la dominacion Espanola, pg. 346 by Luis M. Diaz Soler

Holohan, Renagh. The Irish Châteaux – In search of Descendants of the Wild Geese, with illustrations by Jeremy Williams, published by The Lilliput Press, Dublin, 2008.

British Museum, Harl. Ms. 5885 (N.L.I. Dublin POS no. 1426) and British Museum, Harl. Ms. 6096 (N.L.I. Dublin POS no. 1427)

Sidney, H., Sir Henry Sidney's Memoir of his government of Ireland 1583, Ulster Journal of Archaeology, First series, Vol. III, 1855, p. 46. Footnote no. 6.

Burkes of East Galway, Volume 1

Journal of Genetic Genealogy, http://jogg.info/22/ONeill.pdf