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US Department of Homeland Security. (June 24, 2020). Number of terrorist attacks worldwide in 2019, by perpetrator [Graph]. In Statista. Retrieved April 19, 2021, from https://www.statista.com/statistics/728964/number-of-terrorist-attacks-worldwide-by-perpetrator/
US Department of Homeland Security. "Number of terrorist attacks worldwide in 2019, by perpetrator ." Chart. June 24, 2020. Statista. Accessed April 19, 2021. https://www.statista.com/statistics/728964/number-of-terrorist-attacks-worldwide-by-perpetrator/
US Department of Homeland Security. (2020). Number of terrorist attacks worldwide in 2019, by perpetrator . Statista. Statista Inc.. Accessed: April 19, 2021. https://www.statista.com/statistics/728964/number-of-terrorist-attacks-worldwide-by-perpetrator/
US Department of Homeland Security. "Number of Terrorist Attacks Worldwide in 2019, by Perpetrator ." Statista, Statista Inc., 24 Jun 2020, https://www.statista.com/statistics/728964/number-of-terrorist-attacks-worldwide-by-perpetrator/
US Department of Homeland Security, Number of terrorist attacks worldwide in 2019, by perpetrator Statista, https://www.statista.com/statistics/728964/number-of-terrorist-attacks-worldwide-by-perpetrator/ (last visited April 19, 2021)
