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OPEC. (July 16, 2014). Proved oil and NGL reserves of top global oil companies from 2011 to 2013 (in million barrels)* [Graph]. In Statista. Retrieved January 20, 2021, from https://www.statista.com/statistics/283558/leading-world-oil-companies-by-proved-oil-reserves/
OPEC. "Proved oil and NGL reserves of top global oil companies from 2011 to 2013 (in million barrels)*." Chart. July 16, 2014. Statista. Accessed January 20, 2021. https://www.statista.com/statistics/283558/leading-world-oil-companies-by-proved-oil-reserves/
OPEC. (2014). Proved oil and NGL reserves of top global oil companies from 2011 to 2013 (in million barrels)*. Statista. Statista Inc.. Accessed: January 20, 2021. https://www.statista.com/statistics/283558/leading-world-oil-companies-by-proved-oil-reserves/
OPEC. "Proved Oil and Ngl Reserves of Top Global Oil Companies from 2011 to 2013 (in Million Barrels)*." Statista, Statista Inc., 16 Jul 2014, https://www.statista.com/statistics/283558/leading-world-oil-companies-by-proved-oil-reserves/
OPEC, Proved oil and NGL reserves of top global oil companies from 2011 to 2013 (in million barrels)* Statista, https://www.statista.com/statistics/283558/leading-world-oil-companies-by-proved-oil-reserves/ (last visited January 20, 2021)
