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China National Petroleum Corporation. (March 21, 2013). Operating income of the China National Petroleum Corporation (CNPC) from 2009 to 2012 (in billion yuan) [Graph]. In Statista. Retrieved January 23, 2021, from https://www.statista.com/statistics/284711/operating-income-of-the-china-national-petroleum-corporation-cnpc/
China National Petroleum Corporation. "Operating income of the China National Petroleum Corporation (CNPC) from 2009 to 2012 (in billion yuan)." Chart. March 21, 2013. Statista. Accessed January 23, 2021. https://www.statista.com/statistics/284711/operating-income-of-the-china-national-petroleum-corporation-cnpc/
China National Petroleum Corporation. (2013). Operating income of the China National Petroleum Corporation (CNPC) from 2009 to 2012 (in billion yuan). Statista. Statista Inc.. Accessed: January 23, 2021. https://www.statista.com/statistics/284711/operating-income-of-the-china-national-petroleum-corporation-cnpc/
China National Petroleum Corporation. "Operating Income of The China National Petroleum Corporation (Cnpc) from 2009 to 2012 (in Billion Yuan)." Statista, Statista Inc., 21 Mar 2013, https://www.statista.com/statistics/284711/operating-income-of-the-china-national-petroleum-corporation-cnpc/
China National Petroleum Corporation, Operating income of the China National Petroleum Corporation (CNPC) from 2009 to 2012 (in billion yuan) Statista, https://www.statista.com/statistics/284711/operating-income-of-the-china-national-petroleum-corporation-cnpc/ (last visited January 23, 2021)
