YouTube - RTEWhat role did sectarianism play in the creation of Northern Ireland? video clip, 2021
Google Arts and CultureMemorandum from Arthur Griffith to de Valera on Ulster open_in_new document, 8 November 1921
National Portrait GalleryThe Mad Bull (James Craig, 1st Viscount Craigavon; Michael Collins) cartoon, 15 February 1922
Documents on Irish Foreign Policy Notes of a conference with the Irish Boundary Commission open_in_new document, 3 December 1925