Gaya APA
Qabazard, H, M. (2013).
I need to know: an introduction to the oil industry & OPEC .
Korneburg:
OPEC Secretariat.
Gaya MLA
Qabazard, Hasan, M..
"I need to know: an introduction to the oil industry & OPEC".
Korneburg:
OPEC Secretariat,
2013.
Text.