Não informado. Electrical developments. General Electric, National Lamp Works, Lamp Department.
Chicago-referens (17:e uppl.)Não informado. Electrical Developments. New York: General Electric, National Lamp Works, Lamp Department.
MLA-referens (8:e uppl.)Não informado. Electrical Developments. General Electric, National Lamp Works, Lamp Department.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.