Não informado. Electrical developments. General Electric, National Lamp Works, Lamp Department.
Chicago-viite (17. p.)Não informado. Electrical Developments. New York: General Electric, National Lamp Works, Lamp Department.
MLA-viite (8. p.)Não informado. Electrical Developments. General Electric, National Lamp Works, Lamp Department.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.