National Portrait GalleryThe Mad Bull (James Craig, 1st Viscount Craigavon; Michael Collins) cartoon, 15 February 1922
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
Documents on Irish Foreign Policy Extract from statement by Michael Collins on Northern Ireland policy open_in_new document, 4 February 1922
Flickr - NLIThe shell of the G.P.O. on Sackville Street after the 1916 Rising photograph, May 1916