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.
Cita Chicago (17th ed.)United 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.
Cita MLA (8th ed.)United 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.
Atenció: Aquestes cites poden no estar 100% correctes.