"Sir Henry Campbell-Bannerman's Speech at the London Interparliamentary Conference". The Advocate of Peace, Volume 68, No. 9, archive.org. September 1906.
B. L. Rayner, Thomas Jefferson (1834). “Life of Thomas Jefferson: with selections from the most valuable portions of his voluminious and unrivalled private correspondence : with portrait”, p.236
"What happened when Ryanair boss Michael O’Leary went on Twitter for live Q&A? He crash-landed spectacularly" by Simon Calder, www.independent.co.uk. October 22, 2013.