Lua APA (7ú heag.)

Não informado. (1971). Educational broadcasting international. Centre for Educational Television Overseas.

Lua i Stíl Chicago (17ú heag.)

Não informado. Educational Broadcasting International. London: Centre for Educational Television Overseas, 1971.

Lua MLA (8ú heag.)

Não informado. Educational Broadcasting International. Centre for Educational Television Overseas, 1971.

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