1. National Consortium for the Study of Terrorism and Responses to Terrorism (START). (2016). Global Terrorism Database [Data file]. Retrieved from https://www.start.umd.edu/gtd.
2. Institute for Economics and Peace (IEP). (2016, Nov). Global Terrorism Index 2016: Measuring and Understanding the Impact of Terrorism. Retrieved from http://economicsandpeace.org/wp-content/uploads/2016/11/Global-Terrorism-Index-2016.2.pdf.
3. National Consortium for the Study of Terrorism and Responses to Terrorism (START). (2016). Annex of Statistical Information: Country Reports on Terrorism 2015 (pp. 2–7). Retrieved from https://www.state.gov/documents/organization/257738.pdf.
4. 2016 Terrorist Attacks. Retrieved June 6, 2017, from http://storymaps.esri.com/stories/terrorist-attacks/?year=2016.
5. 2017 Terrorist Attacks. Retrieved June 6, 2017, from http://storymaps.esri.com/stories/terrorist-attacks/?year=2017.