Não informado. (1976). Quarterly oil statistics. Organization for Economic Co-operation and Development.
Lua i Stíl Chicago (17ú heag.)Não informado. Quarterly Oil Statistics. Paris: Organization for Economic Co-operation and Development, 1976.
Lua MLA (8ú heag.)Não informado. Quarterly Oil Statistics. Organization for Economic Co-operation and Development, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.