Gaya APA
Pennwell, . (2003).
Oil & gas Journal, Frontiers of Drilling Technology, Pirinc (Week of Nov 10).
Houston:
Pennwell Books.
Gaya MLA
Pennwell, .
"Oil & gas Journal, Frontiers of Drilling Technology, Pirinc".
Week of Nov 10
Houston:
Pennwell Books,
2003.
Jurnal TP.