Não informado. (1976). Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe.
Chicago-Zitierstil (17. Ausg.)Não informado. Annual Bulletin of Trade in Chemical Products. New York: United Nations, Economic Commission for Europe, 1976.
MLA-Zitierstil (8. Ausg.)Não informado. Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.