Não informado. (1989). Educational Technology Research and Development. Association for Educational Communications and Technology.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Educational Technology Research and Development. Washington: Association for Educational Communications and Technology, 1989.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Educational Technology Research and Development. Association for Educational Communications and Technology, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.