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WHO. (May 5, 2017). Percentage of population using improved drinking-water sources worldwide in 1990, 2000, and 2015, by region [Graph]. In Statista. Retrieved August 04, 2021, from https://www.statista.com/statistics/280145/population-using-improved-drinking-water-sources-worldwide-by-region/
WHO. "Percentage of population using improved drinking-water sources worldwide in 1990, 2000, and 2015, by region." Chart. May 5, 2017. Statista. Accessed August 04, 2021. https://www.statista.com/statistics/280145/population-using-improved-drinking-water-sources-worldwide-by-region/
WHO. (2017). Percentage of population using improved drinking-water sources worldwide in 1990, 2000, and 2015, by region. Statista. Statista Inc.. Accessed: August 04, 2021. https://www.statista.com/statistics/280145/population-using-improved-drinking-water-sources-worldwide-by-region/
WHO. "Percentage of Population Using Improved Drinking-water Sources Worldwide in 1990, 2000, and 2015, by Region." Statista, Statista Inc., 5 May 2017, https://www.statista.com/statistics/280145/population-using-improved-drinking-water-sources-worldwide-by-region/
WHO, Percentage of population using improved drinking-water sources worldwide in 1990, 2000, and 2015, by region Statista, https://www.statista.com/statistics/280145/population-using-improved-drinking-water-sources-worldwide-by-region/ (last visited August 04, 2021)
