APA Style
OPEC Bulletin Vol 5-6 2019. (2019).
Vienna, Austria:
Opec.
Chicago Style
OPEC Bulletin Vol 5-6 2019.
.
Vienna, Austria:
Opec,
2019.
Buletin.
MLA Style
OPEC Bulletin Vol 5-6 2019.
.
Vienna, Austria:
Opec,
2019.
Buletin.
Turabian Style
OPEC Bulletin Vol 5-6 2019.
Vienna, Austria:
Opec,
2019.
Buletin.