Não informado. (1922). Engineering and Mining Journal-Press. McGraw-Hill Publications.
Chicago-referens (17:e uppl.)Não informado. Engineering and Mining Journal-Press. New York: McGraw-Hill Publications, 1922.
MLA-referens (8:e uppl.)Não informado. Engineering and Mining Journal-Press. McGraw-Hill Publications, 1922.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.