APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.