Andrew, Christopher M., The Defence of the Realm : The Authorized History of Mi5, London: Allen Lane, 2009.
Blum, Howard, Dark Invasion : 1915: Germany’s Secret War and the Hunt for the First Terrorist Cell in America, Melbourne: Scribe, 2014.
Hampshire, James, ”Spy Fever’ in Britain, 1900 to 1914′, Historian.
Hiley, Nicholas, ‘The Failure of British Counter-Espionage against Germany, 1907-1914’, Historical Journal, Vol. 28, No. 4 (1985): 835-862.
Hiley, Nicholas, ‘Spying for the Kaiser’, History Today, No. 6 (1988): 37.
Hiley, Nicholas, ‘Entering the Lists: Mi5’s Great Spy Round-up of August 1914’, Intelligence & National Security, Vol. 21, No. 1 (2006): 46-76.
Hiley, Nicholas, ‘Re-Entering the Lists: Mi5’s Authorized History and the August 1914 Arrests’, Intelligence & National Security, Vol. 25, No. 4 (2010): 415-452.
Hiley, Nicholas P., ‘The Failure of British Espionage against Germany, 1907-1914’, Historical Journal, Vol. 26, No. 4 (1983): 867-889.
Hitchner, Thomas, ‘Edwardian Spy Literature and the Ethos of Sportsmanship: The Sport of Spying’, English Literature in Transition, 1880-1920, Vol. 53, (2010): 413-430.
Jeffery, Keith, Mi6 : The History of the Secret Intelligence Service, 1909-1949, Pbk. ed. ed., London: Bloomsbury, 2011.
Kemp, Sandra; Mitchell, Charlotte; Trotter, David. Spies of the Kaiser: Plotting the Downfall of England The Oxford Companion to Edwardian Fiction: Oxford University Press, 2005, http://www.oxfordreference.com/10.1093/acref/9780198117605.001.0001/acref-9780198117605-e-1086.
Kemp, Sandra; Mitchell, Charlotte; Trotter, David. Spy Fiction The Oxford Companion to Edwardian Fiction: Oxford University Press, 2005, http://www.oxfordreference.com/10.1093/acref/9780198117605.001.0001/acref-9780198117605-e-1087.
Price, Thomas J., ‘Spy Stories, Espionage and the Public in the Twentieth Century’, Journal of Popular Culture, Vol. 30, No. 3 (1996): 81-89.
Smith, Michael May, The Spying Game : The Secret History of British Espionage, Updated and expanded ed. ed., London: Politico’s, 2002.
Stafford, David, The Silent Game : The Real World of Imaginary Spies, Marston Gate: Amazon.co.uk, 2013.
Stafford, David A. T., ‘Spies and Gentlemen: The Birth of the British Spy Novel, 1893-1914’, Victorian Studies, Vol. 24, (1981): 489.
Woods, Brett F., Neutral Ground : A Political History of Espionage Fiction, New York: Algora Pub., 2008.