Hathi Trust Digital LibraryThe struggle of the Irish people. Address to the Congress of the United States book, January 1921
National Archives UK Letter from General Smuts to Eamon de Valera open_in_new letter, 4 August 1921
National Archives UK Cabinet Memorandum. The Irish Situation. open_in_new document, 30 May 1922
National Archives UK Cabinet Memorandum – Ireland (Draft Constitution) open_in_new document, 1 June 1922