Não informado. (1969). Highways & Traffic Engineering. IPC Building and Contract Journals.
Chicago-referens (17:e uppl.)Não informado. Highways & Traffic Engineering. London: IPC Building and Contract Journals, 1969.
MLA-referens (8:e uppl.)Não informado. Highways & Traffic Engineering. IPC Building and Contract Journals, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.