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
Bicycles, Barracks & BandoliersMemo regarding Catholic recruitment in the RUC and USC memo, March 1922