United Nations. Economic Commission for Europe. (1983). Catalogue of building systems and components approved at the national level and aimed at international trade: Agreed format and example catalogue. United Nations.
Dyfyniad Arddull ChicagoUnited Nations. Economic Commission for Europe. Catalogue of Building Systems and Components Approved at the National Level and Aimed at International Trade: Agreed Format and Example Catalogue. New York: United Nations, 1983.
Dyfyniad MLAUnited Nations. Economic Commission for Europe. Catalogue of Building Systems and Components Approved at the National Level and Aimed at International Trade: Agreed Format and Example Catalogue. United Nations, 1983.
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