1. E.J. Hobsbawm, The Age of Empire 1875–1914 (London: Weidenfeld and Nicolson, 1987), p. 56.
2. George Woodcock, Anarchism: A History of Libertarian Ideas and Movements (Harmondsorth: Penguin, 1986);
3. John Quail, The Slow Burning Fuse (London: Paladin, 1978);
4. Richard Bach Jensen, ‘Daggers, Rifles and Dynamite: Anarchism Terrorism in 19th Century Europe’ Terrorism and Political Violence 16 (2004), pp. 116–53
5. and ‘The Evolution of Anarchist Terrorism in Europe and the United States from the Ninteenth Century to World War I’ in Brett Bowden and Michael T. Davis, eds, Terror: From Tyrannicide to Terrorism (St Lucia, Queensland: University of Queensland Press, 2008), pp. 134–60.