Não informado. (1976). Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe.
Citace podle Chicago (17th ed.)Não informado. Annual Bulletin of Trade in Chemical Products. New York: United Nations, Economic Commission for Europe, 1976.
Citace podle MLA (8th ed.)Não informado. Annual Bulletin of Trade in Chemical Products. United Nations, Economic Commission for Europe, 1976.
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