McKeough, K. (1989). A visual overview of world oil markets. Industry and Energy Department World Bank.
Lua i Stíl Chicago (17ú heag.)McKeough, Kay. A Visual Overview of World Oil Markets. Washington D.C: Industry and Energy Department World Bank, 1989.
Lua MLA (9ú heag.)McKeough, Kay. A Visual Overview of World Oil Markets. Industry and Energy Department World Bank, 1989.
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