Não informado. (1976). Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe.
Lua i Stíl Chicago (17ú heag.)Não informado. Annual Bulletin of Trade in Chemical Products. New York: United Nations, Economic Commission for Europe, 1976.
Lua MLA (8ú heag.)Não informado. Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.