Não informado. (1993). New Steel Construction. British Constructional Steelwork Association.
Lua i Stíl Chicago (17ú heag.)Não informado. New Steel Construction. Birmingham, Inglaterra: British Constructional Steelwork Association, 1993.
Lua MLA (8ú heag.)Não informado. New Steel Construction. British Constructional Steelwork Association, 1993.
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