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.

Nielsen, H. Dean, and 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.

Nielsen, H. Dean, and Diana H. Kirk. Learning Environments and Learning Outcomes: A Review of Research Literature. Southeast Asia Development Advisory Group of the Asia Society, 1973.