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Sources:
Barnett, WS. (2006). Benefits of preschool for all. [PDF document]. Retrieved from http://nieer.org/resources/files/Benefits.pdf
O’Brien, EM. & Dervarics. (2007). Pre-kindergarten: what the research shows. Retrieved from http://www.centerforpubliceducation.org/Main-Menu/Pre-kindergarten/Pre-Kindergarten/Pre-kindergarten-What-the-research-shows.html
Gormley,W., Gayer,T., Phillips,D. & Dawson,B. (2004). The effects of Oklahoma’s universal pre-kindergarten programs on school readiness. Retrieved from http://www.crocus.georgetown.edu/reports/executive_summary_11_04.pdf