1. Europol. (2018). TE-SAT 2018: EU terrorism situation and trend report. Publications Office of the European Union.
2. European Agenda on Security - Migration and Home Affairs - European Commission. (2016). Retrieved from https://ec.europa.eu/home-affairs/what-we-do/policies/european-agenda-security_en.
3. Joint statement of EU Ministers for Justice and Home Affairs and representatives of EU institutions on the terrorist attacks in Brussels on 22 March 2016 - Consilium. Retrieved from http://www.consilium.europa.eu/en/press/pressreleases/2016/03/24/statement-on-terrorist-attacks-in-brussels-on-22-march.
4. Terrorist groups recruiting through social media | CBC News. (2012). Retrieved from https://www.cbc.ca/news/technology/terrorist-groups-recruiting-through-social-media-1.1131053.
5. Europol. Internet Organised Crime Threat Assessment (IOCTA). (2017). Retrieved from https://www.europol.europa.eu/iocta/2017/index.html