Não informado. (1973). Illinois school research and development. Illinois Association for Supervision and Curriculum Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Illinois School Research and Development. Nottingham, Inglaterra: Illinois Association for Supervision and Curriculum Development, 1973.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Illinois School Research and Development. Illinois Association for Supervision and Curriculum Development, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.