Não informado. (1991). Structural Engineering International. International Association for Bridge and Structural Engineering.
Chicago-referens (17:e uppl.)Não informado. Structural Engineering International. Zurich, Suíça: International Association for Bridge and Structural Engineering, 1991.
MLA-referens (8:e uppl.)Não informado. Structural Engineering International. International Association for Bridge and Structural Engineering, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.