Dyfyniad APA

Orwel, G. (2006). Black gold: The new frontier in oil for investors. Hoboken, N.J: John Wiley & Sons.

Dyfyniad Arddull Chicago

Orwel, George. Black Gold: The New Frontier in Oil for Investors. Hoboken, N.J: John Wiley & Sons, 2006.

Dyfyniad MLA

Orwel, George. Black Gold: The New Frontier in Oil for Investors. Hoboken, N.J: John Wiley & Sons, 2006.

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