National Museums Ireland
Howth Gun Running, 1914
Photograph, 26 July 1914
UCD History Hub
Arthur Griffith, Sinn Fein and the IRB (The Irish Revolution Lecture 3)
podcast, 2014
RTE Century Ireland
Introducing de Valera – The East Clare by-election and the rise of an Irish political leader
open_in_newarticle, 2017
Hathi Trust Digital Library
The struggle of the Irish people. Address to the Congress of the United States
book, January 1921