Não informado. (1919). Cement, Mill and Quarry. National Trade Journals.
Chicago-referens (17:e uppl.)Não informado. Cement, Mill and Quarry. New York: National Trade Journals, 1919.
MLA-referens (8:e uppl.)Não informado. Cement, Mill and Quarry. National Trade Journals, 1919.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.