Não informado. (2000). Transportation engineer. American Cartagemen Publishing Corporation.
Chicago-referens (17:e uppl.)Não informado. Transportation Engineer. Mount Morris, Ill: American Cartagemen Publishing Corporation, 2000.
MLA-referens (8:e uppl.)Não informado. Transportation Engineer. American Cartagemen Publishing Corporation, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.