Irish, Tomás (2016). "A man called Mahaffy: an Irish cosmopolitan confronts crisis, 1899–1919". Historical Research. 89 (246): 846–865. doi:10.1111/1468-2281.12157.
earlscliffe.com
As quoted on the website www.earlscliffe.com, which, in turn, was taken from the Mahaffy biography by W. B. Stanford & R. B. McDowell (1971). Permission to quote this was given by the Earlscliffe website owner, David Foley 28 August 2012