^R. Heickerö: Cyber Terrorism: Electronic Jihad, Strategic Analysis (Institute for Defence Studies and Analyses), Volume 38, Issue 4, p.561. Taylor & Francis, 2014.
^Langenohl, Andreas Langenohl & Westphal, Kirsten. (eds.) "Comparing and Inter-Relating the European Union and the Russian Federation", Zentrum für internationale Entwicklungs- und Umweltforschung der Justus-Liebig-Universität Gießen, November 2006, p.84.
^Michael, George. (2006) The Enemy of My Enemy: The Alarming Convergence of Militant Islam and the Extreme Right. University Press of Kansas, p. 142ff.
^ abMonika Bartoszewicz: Controversies Of Conversions: The Potential Terrorist Threat of European Converts to Islam, PhD thesis, University of St Andrews (School of International Relations), 2012, p.71.
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