RTE Century IrelandSinn Féin leaders arrested over alleged ‘German plot’ open_in_new article, 2018
History HubDiarmaid Ferriter discusses the Anglo Irish Treaty (Full Interview) video clip, 2020
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