Não informado. Electrical developments. General Electric, National Lamp Works, Lamp Department.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Electrical Developments. New York: General Electric, National Lamp Works, Lamp Department.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Electrical Developments. General Electric, National Lamp Works, Lamp Department.
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