APA
ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, . (1979). Annual report,1979. Austria: Organization of the petroleum Exporting Countries.
Chicago
ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, . 1979. Annual report,1979. Austria: Organization of the petroleum Exporting Countries.
Harvard
ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, . (1979). Annual report,1979. Austria: Organization of the petroleum Exporting Countries.
MLA
ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, ORGANIZATION OF THE PETROLEUM EXPORTING COUNTRIES, . Annual report,1979. Austria: Organization of the petroleum Exporting Countries. 1979.
