History Ireland Tit-for-tat: the War of Independence in the northern counties open_in_new article, 2012
National Museums IrelandThe last letter written by Seán Mac Diarmada (Sean MacDermott) letter, 11 May 1916
dippamRoyal Commission on Arrest and subsequent treatment of Mr. Francis Sheehy Skeffington open_in_new document, August 1916