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→Sources
* BP Statistical Review of oil price
* BP Statistical Review of oil price
* United Nations Population review 2014
* United Nations Population review 2014
* www.en.wikipedia.org/wiki/Price_of_petroleum
* [http://www.en.wikipedia.org/wiki/Price_of_petroleum Wikipedia, The price of petroleum]
* www.macrotrends.net/crudeoil_price
* [http://www.macrotrends.net/crudeoil_price Macrotrends, Crude Oil Price]
* www.theenergycollective.com
* [http://www.theenergycollective.com The Energy Collective]
* www.opec.org
* [http://www.opec.org OPEC]