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3. Singer, D.G., Golinkoff, R.M., & Hirsh-Pasek, K. (Eds.). (2006). Play = Learning. New York: Oxford University Press.

4. Mistrett, S., Lane, S., Goetz, A. (1995-2000). Professional guide to: Assisting Families in Creating Play Environments for children with disabilities. Retrieved July 15, 2008 from Let's Play Project. http://eric.ed.gov/ERICDocs/data/ericdocs2sql/content_storage_01/0000019b/80/16/ac/a9.pdf

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7. Let's Play! Project. (2007). Emerging Play Stages. Retrieved July 15, 2008 from http://letsplay.buffalo.edu/Emerging%20Play%20Stages.pdf

8.Ruffino A.M., & Mistrett, S. G. (2007). Toys everyone can play with: Selecting universal design features. OT Practice, 12(21), 9-13.

9.Krafft, K.C., & Berk, L.E. (1998). Private speech in two preschools: Significance of open-ended activities and make-believe play for verbal self-regulation. Early Childhood Research Quarterly, 13(4), 637-658.

10. Cynthia L. Elias, Laura E. Berk. (2002). Self-regulation in young children: Is there a role for sociodramatic play? Early Childhood Research Quarterly, 17, 216-222.

11. Kassow, D.Z. (2006, August). Environmental Print Awareness in Young Children (Volume 1, Number 3). Retrieved July 18,2008 from Talaris Organization Web site: www.talaris.org/pdf/research/EnviroPrintAwareness.pdf