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Lua i Stíl Chicago (17ú heag.).Wionczek, Miguel S. World Hydrocarbon Markets: Current Status, Projected Prospects, and Future Trends. [Oxford [Oxfordshire ; New York: Pergamon Press, 1983.
Lua MLA (9ú heag.).Wionczek, Miguel S. World Hydrocarbon Markets: Current Status, Projected Prospects, and Future Trends. Pergamon Press, 1983.
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