Não informado. (1963). Memo to the Faculty. University of Michigan, Center for Research on Learning and Teaching.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Memo to the Faculty. Ann Arbor, Mich: University of Michigan, Center for Research on Learning and Teaching, 1963.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Memo to the Faculty. University of Michigan, Center for Research on Learning and Teaching, 1963.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.