Джеймс Мортон: Шпионы Первой мировой войны

Karyn Miller, 'British spy fired the shot that finished off Rasputin', Daily Telegraph, 19 September 2004.

M.E. Occleshaw, 'British Military Intelligence in the First World War', University of Keele Ph.D. thesis, 1984. Intelligence Corps Archives.

C. Olsson in Picture Post, 26 November 1938.

Markus Pohlmann, 'Talking about Schluga', cited in Cees Wiebes, Intelligence and the War in Bosnia, 1992-1995

Bernard Porter, 'M: MIs's First Spymaster', The English Historical Review 120 (2005).

Gary Sheffield, 'First World War, Day One The Road to War', partwork series in The Guardian, 2008.

Catherine Speck, 'Edith Cavell: Martyr or Patriot' in Australian and New Zealand Journal of Art 2, no. 1, 2001.

Richard B. Spence, 'Sidney Reilly in America 1914-1917', Intelligence and National Security, vol. 10., no. 1, January 1995.

J.B. Sterndale Bennett, 'I Guarded Spies in The Tower', The Great War: I was There, Pt22. Ferdinand Touhy, 'Women as Secret Service Agents', The Statesman, 17 January 1926.

Ernest Wittenberg, 'The Thrifty Spy on the Sixth Avenue III, American Heritage Magazine, December 1965, vol. 17, issue 1.

R.A.B. Young, 'Even Wars have Ears', The Territorial, February, 1938.