Levin, B. (2011). WTI and Brent Benchmarks: The relative value of crude oil between North America and Europe. Oxford Institute for Energy Studies.
Lua i Stíl Chicago (17ú heag.)Levin, B. WTI and Brent Benchmarks: The Relative Value of Crude Oil Between North America and Europe. Oxford Institute for Energy Studies, 2011.
Lua MLA (9ú heag.)Levin, B. WTI and Brent Benchmarks: The Relative Value of Crude Oil Between North America and Europe. Oxford Institute for Energy Studies, 2011.
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