एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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