Não informado. Electrical developments. General Electric, National Lamp Works, Lamp Department.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Electrical Developments. New York: General Electric, National Lamp Works, Lamp Department.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Electrical Developments. General Electric, National Lamp Works, Lamp Department.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.