Não informado. (1956). Point to point telecommunication. Marconi's Wireless Telegraph.
Lua i Stíl Chicago (17ú heag.)Não informado. Point to Point Telecommunication. Chelmsford, Inglaterra: Marconi's Wireless Telegraph, 1956.
Lua MLA (8ú heag.)Não informado. Point to Point Telecommunication. Marconi's Wireless Telegraph, 1956.
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