APA Style
OPEC bulletin Vol. 8-9 2020. (2020).
Vienna, Austria:
Opec.
Chicago Style
OPEC bulletin Vol. 8-9 2020.
.
Vienna, Austria:
Opec,
2020.
Buletin.
MLA Style
OPEC bulletin Vol. 8-9 2020.
.
Vienna, Austria:
Opec,
2020.
Buletin.
Turabian Style
OPEC bulletin Vol. 8-9 2020.
Vienna, Austria:
Opec,
2020.
Buletin.