Não informado. (1906). Engineering and contracting. Engineering and Contracting Publishing.
Chicago-referens (17:e uppl.)Não informado. Engineering and Contracting. Chicago, Ill: Engineering and Contracting Publishing, 1906.
MLA-referens (8:e uppl.)Não informado. Engineering and Contracting. Engineering and Contracting Publishing, 1906.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.