YouTube - RTEWhat role did sectarianism play in the creation of Northern Ireland? video clip, 2021
British Academy Political History of Northern Ireland since Partition open_in_new Article, 1999
UCD Digital LibraryGroup of IFS Army soldiers firing artillery on the Four Courts photograph, 28 June 1922
National Archives UK Cabinet Memorandum. Ireland – Capture of Four Courts. open_in_new document, 30 June 1922
Bureau of Military HistoryThe Minister of Defence orders that the Convention be not held newsletter, 31 March 1922