1. Basra, R. & Neumann, P. (2016). Criminal pasts, terrorist futures: European jihadists and the nNew crime-terror nexus. Perspectives on Terrorism, 10. http://www.terrorismanalysts.com/pt/index.php/pot/article/view/554.
2. BBC News. (2013, 23 May). Woolwich machete attack leaves man dead. https://www.bbc.com/news/uk-22630303.
3. Bertin, N. (2013, 25 May). French soldier stabbed while on patrol near Paris. Reuters. https://www.reuters.com/article/us-france-stabbing-idUSBRE94O09420130525.
4. Crumley, B. (2015, November 17). Were the Paris attacks a French intelligence failure? Al Jazeera. http://america.aljazeera.com/articles/2015/11/17/were-paris-attacks-a-french-intelligence-failure.html.
5. The Economist. (2013, 25 May). Return to old-style terror. https://www.economist.com/britain/2013/05/25/return-to-old-style-terror.