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National Geographic. (March 1, 2016). Percentage of population without access to improved water sources worldwide from 1990 to 2015 [Graph]. In Statista. Retrieved May 16, 2021, from https://www.statista.com/statistics/519547/population-without-access-to-improved-water-sources-worldwide/
National Geographic. "Percentage of population without access to improved water sources worldwide from 1990 to 2015." Chart. March 1, 2016. Statista. Accessed May 16, 2021. https://www.statista.com/statistics/519547/population-without-access-to-improved-water-sources-worldwide/
National Geographic. (2016). Percentage of population without access to improved water sources worldwide from 1990 to 2015. Statista. Statista Inc.. Accessed: May 16, 2021. https://www.statista.com/statistics/519547/population-without-access-to-improved-water-sources-worldwide/
National Geographic. "Percentage of Population without Access to Improved Water Sources Worldwide from 1990 to 2015." Statista, Statista Inc., 1 Mar 2016, https://www.statista.com/statistics/519547/population-without-access-to-improved-water-sources-worldwide/
National Geographic, Percentage of population without access to improved water sources worldwide from 1990 to 2015 Statista, https://www.statista.com/statistics/519547/population-without-access-to-improved-water-sources-worldwide/ (last visited May 16, 2021)
