Butler, T. B. (1939). The origins of the Butlers in Ireland.
Lua i Stíl Chicago (17ú heag.)Butler, T. Blake. The Origins of the Butlers in Ireland. 1939.
Lua MLA (9ú heag.)Butler, T. Blake. The Origins of the Butlers in Ireland. 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
