Não informado. (1967). Educational television international. Centre for Educational Television Overseas.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Educational Television International. London: Centre for Educational Television Overseas, 1967.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Educational Television International. Centre for Educational Television Overseas, 1967.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.