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
Documents on Irish Foreign Policy The Collins – Craig agreement open_in_new document, 23 January 1922
Documents on Irish Foreign Policy Notes of a conference with the Irish Boundary Commission open_in_new document, 3 December 1925