Não informado. (1948). Highway Engineer. Institution of Highway Engineers.
Chicago-referens (17:e uppl.)Não informado. Highway Engineer. London: Institution of Highway Engineers, 1948.
MLA-referens (8:e uppl.)Não informado. Highway Engineer. Institution of Highway Engineers, 1948.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.
