APA Style
OPEC Bulletin Vol 6-7 2018. (2014).
Vienna, Austria:
Opec.
Chicago Style
OPEC Bulletin Vol 6-7 2018.
6-7/18.
Vienna, Austria:
Opec,
2014.
Majalah Populer.
MLA Style
OPEC Bulletin Vol 6-7 2018.
6-7/18.
Vienna, Austria:
Opec,
2014.
Majalah Populer.
Turabian Style
OPEC Bulletin Vol 6-7 2018.
Vienna, Austria:
Opec,
2014.
Majalah Populer.