Não informado. (1971). Educational broadcasting international. Centre for Educational Television Overseas.
Chicago-referens (17:e uppl.)Não informado. Educational Broadcasting International. London: Centre for Educational Television Overseas, 1971.
MLA-referens (8:e uppl.)Não informado. Educational Broadcasting International. Centre for Educational Television Overseas, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.