Lee Child (2015). “The Essential Jack Reacher, Volume 1, 7-Book Bundle: Persuader, The Enemy, One Shot, The Hard Way, Bad Luck and Trouble, Nothing to Lose, Gone Tomorrow”, p.992, Delacorte Press
James Boswell, Samuel Johnson (1799). “Life of Johnson: Including Boswell's Journal of a Tour to the Hebrides and Johnson's Diary of a Journey Into North Wales”, p.526