1. Bailey, D. B., Clifford, R. M., & Harms, T. (1982): Comparison of preschool environments for handicapped and nonhandicapped children.Topics in Early Childhood Special Education.2, 9–20.
2. Bailey, D. B., & Wolery, M. (1992).Teaching Infants and Preschoolers with Disabilities, 2nd ed. New York: Merrill.
3. Feeney, S., Christensen, D., & Moravcik, E. (1987).Who Am I in the Lives of Children. Columbus: Merrill.
4. Harms, T., & Clifford, R. M. (1984).Early Childhood Environment Rating Scale. New York: Teachers College, Columbia University.
5. Jones, E. (1977).Dimensions of Teaching-Learning Environments: Handbook for Teachers. Pasadena, CA: Pacific Oaks.