Não informado. (1971). Educational broadcasting international. Centre for Educational Television Overseas.
Citação do estilo Chicago (17ª ed.)Não informado. Educational Broadcasting International. London: Centre for Educational Television Overseas, 1971.
Citação MLA (8ª ed.)Não informado. Educational Broadcasting International. Centre for Educational Television Overseas, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.