Gaya APA
Pennwell, . (2003).
Oil & gas Journal, Assessing Fundamentals of long -term oil (Week of Sept 29).
Houston:
Penn Well.
Gaya MLA
Pennwell, .
"Oil & gas Journal, Assessing Fundamentals of long -term oil".
Week of Sept 29
Houston:
Penn Well,
2003.
Jurnal TP.