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Global Terrorism Database. (July 16, 2020). Terrorism: Most active perpetrator groups worldwide in 2019, based on number of attacks [Graph]. In Statista. Retrieved January 25, 2021, from https://www.statista.com/statistics/937553/terrorism-most-active-perpetrator-groups-worldwide/
Global Terrorism Database. "Terrorism: Most active perpetrator groups worldwide in 2019, based on number of attacks." Chart. July 16, 2020. Statista. Accessed January 25, 2021. https://www.statista.com/statistics/937553/terrorism-most-active-perpetrator-groups-worldwide/
Global Terrorism Database. (2020). Terrorism: Most active perpetrator groups worldwide in 2019, based on number of attacks. Statista. Statista Inc.. Accessed: January 25, 2021. https://www.statista.com/statistics/937553/terrorism-most-active-perpetrator-groups-worldwide/
Global Terrorism Database. "Terrorism: Most Active Perpetrator Groups Worldwide in 2019, Based on Number of Attacks." Statista, Statista Inc., 16 Jul 2020, https://www.statista.com/statistics/937553/terrorism-most-active-perpetrator-groups-worldwide/
Global Terrorism Database, Terrorism: Most active perpetrator groups worldwide in 2019, based on number of attacks Statista, https://www.statista.com/statistics/937553/terrorism-most-active-perpetrator-groups-worldwide/ (last visited January 25, 2021)
