Gaya APA
Orwel, George. (2006).
Black gold : the new frontier in oil for investors / George Orwel .
New Jersey:
John Wiley \r Sons.
Gaya Chicago
Orwel, George.
Black gold : the new frontier in oil for investors / George Orwel.
New Jersey:
John Wiley \r Sons,
2006.
Buku.
Gaya MLA
Orwel, George.
Black gold : the new frontier in oil for investors / George Orwel.
New Jersey:
John Wiley \r Sons,
2006.
Buku.
Gaya Turabian
Orwel, George.
Black gold : the new frontier in oil for investors / George Orwel.
New Jersey:
John Wiley \r Sons,
2006.
Buku.