Henry Moseley's letter to Margery Moseley (February 2, 1913), as quoted in "H. G. J. Moseley: The Life and Letters of an English Physicist 1887-1915" edited by J. L. Heilbron (p. 201), 1974.
Charles Proteus Steinmetz, Joseph Le Roy Hayden (1917). “Steinmetz Electrical Engineering Library: Engineering mathematics; a series of lectures delivered at Union college (3rd ed. 1917)”
"Comedian Dylan Moran: 'What am I looking forward to? Incontinence and memory loss'". Interview with Nosheen Iqbal, www.theguardian.com. December 22, 2009.