Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.