Nielsen, H. D., & Kirk, D. H. (1973). Learning environments and learning outcomes: A review of research literature. Southeast Asia Development Advisory Group of the Asia Society.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nielsen, H. Dean, و Diana H. Kirk. Learning Environments and Learning Outcomes: A Review of Research Literature. New York: Southeast Asia Development Advisory Group of the Asia Society, 1973.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Nielsen, H. Dean, و Diana H. Kirk. Learning Environments and Learning Outcomes: A Review of Research Literature. Southeast Asia Development Advisory Group of the Asia Society, 1973.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.