Naciones Unidas. Economic Comission for Europe, Génova. (1993). Directory of chemical producers and products: Chemical enterprises in Central and Eastern Europe. Naciones Unidas.
Cita Chicago Style (17a ed.)Naciones Unidas. Economic Comission for Europe, Génova. Directory of Chemical Producers and Products: Chemical Enterprises in Central and Eastern Europe. Nueva York: Naciones Unidas, 1993.
Cita MLA (9a ed.)Naciones Unidas. Economic Comission for Europe, Génova. Directory of Chemical Producers and Products: Chemical Enterprises in Central and Eastern Europe. Naciones Unidas, 1993.
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