Παραπομπή σε μορφή APA (7η εκδ.)

Levin, B. (2011). WTI and Brent Benchmarks: The relative value of crude oil between North America and Europe. Oxford Institute for Energy Studies.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Levin, B. WTI and Brent Benchmarks: The Relative Value of Crude Oil Between North America and Europe. Oxford Institute for Energy Studies, 2011.

Παραπομπή σε μορφή MLA (9th εκδ.)

Levin, B. WTI and Brent Benchmarks: The Relative Value of Crude Oil Between North America and Europe. Oxford Institute for Energy Studies, 2011.