Não informado. (1920). Metropolitan-Vickers gazette. Associated Electrical Industries.
Lua i Stíl Chicago (17ú heag.)Não informado. Metropolitan-Vickers Gazette. Manchester, Inglaterra: Associated Electrical Industries, 1920.
Lua MLA (8ú heag.)Não informado. Metropolitan-Vickers Gazette. Associated Electrical Industries, 1920.
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