Simms, Katharine. (2000). From kings to warlords : the changing political structure of Gaelic Ireland in the later Middle Ages. Woodbridge: Boydell Press. p. 46. ISBN0-85115-784-X. OCLC43378269.
Jaski, Bart (2013). Early Irish kingship and succession (Paperback ed.). Dublin, Ireland. p. 128. ISBN978-1-84682-909-3. OCLC1157209958.{{cite book}}: CS1 maint: location missing publisher (link)