Não informado. Civil engineering. U.S. Department of Commerce, National Technical Information Service.
Chicago-referens (17:e uppl.)Não informado. Civil Engineering. Springfield, Va: U.S. Department of Commerce, National Technical Information Service.
MLA-referens (8:e uppl.)Não informado. Civil Engineering. U.S. Department of Commerce, National Technical Information Service.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.