Não informado. (1937). Beama journal. British Electrical and Allied Manufacturers Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Beama Journal. London: British Electrical and Allied Manufacturers Association, 1937.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Beama Journal. British Electrical and Allied Manufacturers Association, 1937.
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