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UBS, & Wealth-X. (November 6, 2013). Source of wealth for billionaires around the world in 2013 [Graph]. In Statista. Retrieved January 17, 2021, from https://www.statista.com/statistics/299248/billionaires-wealth-source/
UBS, und Wealth-X. "Source of wealth for billionaires around the world in 2013." Chart. November 6, 2013. Statista. Accessed January 17, 2021. https://www.statista.com/statistics/299248/billionaires-wealth-source/
UBS, Wealth-X. (2013). Source of wealth for billionaires around the world in 2013. Statista. Statista Inc.. Accessed: January 17, 2021. https://www.statista.com/statistics/299248/billionaires-wealth-source/
UBS, and Wealth-X. "Source of Wealth for Billionaires around The World in 2013." Statista, Statista Inc., 6 Nov 2013, https://www.statista.com/statistics/299248/billionaires-wealth-source/
UBS & Wealth-X, Source of wealth for billionaires around the world in 2013 Statista, https://www.statista.com/statistics/299248/billionaires-wealth-source/ (last visited January 17, 2021)
