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World Bank. (May 7, 2019). Share of electricity produced from oil, gas and coal sources in Bulgaria from 1990 to 2015 [Graph]. In Statista. Retrieved March 08, 2021, from https://www.statista.com/statistics/436549/share-of-electricity-from-oil-coal-gas-bulgaria/
World Bank. "Share of electricity produced from oil, gas and coal sources in Bulgaria from 1990 to 2015." Chart. May 7, 2019. Statista. Accessed March 08, 2021. https://www.statista.com/statistics/436549/share-of-electricity-from-oil-coal-gas-bulgaria/
World Bank. (2019). Share of electricity produced from oil, gas and coal sources in Bulgaria from 1990 to 2015. Statista. Statista Inc.. Accessed: March 08, 2021. https://www.statista.com/statistics/436549/share-of-electricity-from-oil-coal-gas-bulgaria/
World Bank. "Share of Electricity Produced from Oil, Gas and Coal Sources in Bulgaria from 1990 to 2015." Statista, Statista Inc., 7 May 2019, https://www.statista.com/statistics/436549/share-of-electricity-from-oil-coal-gas-bulgaria/
World Bank, Share of electricity produced from oil, gas and coal sources in Bulgaria from 1990 to 2015 Statista, https://www.statista.com/statistics/436549/share-of-electricity-from-oil-coal-gas-bulgaria/ (last visited March 08, 2021)
