Foyle, H. C. (1984). The effects of preparation and practice homework on student achievement in tenth-grade American history. Kansas State University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Foyle, Harvey Charles. The Effects of Preparation and Practice Homework on Student Achievement in Tenth-grade American History. Manhattan: Kansas State University, 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Foyle, Harvey Charles. The Effects of Preparation and Practice Homework on Student Achievement in Tenth-grade American History. Kansas State University, 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.