APA Style
OPEC : General Information and Chronology. (1990).
Austria:
Organization of the Petroleum Exporting Countries.
Chicago Style
OPEC : General Information and Chronology.
.
Austria:
Organization of the Petroleum Exporting Countries,
1990.
Text.
MLA Style
OPEC : General Information and Chronology.
.
Austria:
Organization of the Petroleum Exporting Countries,
1990.
Text.
Turabian Style
OPEC : General Information and Chronology.
Austria:
Organization of the Petroleum Exporting Countries,
1990.
Print.