Não informado. (1976). Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe.
Chicago-viite (17. p.)Não informado. Annual Bulletin of Trade in Chemical Products. New York: United Nations, Economic Commission for Europe, 1976.
MLA-viite (8. p.)Não informado. Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe, 1976.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.