Não informado. (1934). Highways, Bridges and Engineering Works. IPC Building and Contract Journals.
Chicago-referens (17:e uppl.)Não informado. Highways, Bridges and Engineering Works. London: IPC Building and Contract Journals, 1934.
MLA-referens (8:e uppl.)Não informado. Highways, Bridges and Engineering Works. IPC Building and Contract Journals, 1934.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.