Gaya APA
Pennwell, . (2003).
Oil & gas Journal, Future Energy Supply-5 Refining Adjustments (Aug 11, Volume 101.31).
Houston:
Penn Well.
Gaya MLA
Pennwell, .
"Oil & gas Journal, Future Energy Supply-5 Refining Adjustments".
Aug 11, Volume 101.31
Houston:
Penn Well,
2003.
Jurnal TP.