Não informado. (1971). Educational broadcasting international. Centre for Educational Television Overseas.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Educational Broadcasting International. London: Centre for Educational Television Overseas, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Educational Broadcasting International. Centre for Educational Television Overseas, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.