Lua APA (7ú heag.)

Não informado. (1970). Point to point communication. Marconi Communication Systems.

Lua i Stíl Chicago (17ú heag.)

Não informado. Point to Point Communication. Chelmsford, Inglaterra: Marconi Communication Systems, 1970.

Lua MLA (8ú heag.)

Não informado. Point to Point Communication. Marconi Communication Systems, 1970.

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