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Hemmeter, M. L., Snyder, P., Fox, L., & Algina, J. (2016). The efficacy of the Pyramid Model: Effects on teachers, classrooms and children. Topics in Early Childhood Special Education. Published online ahead of print.doi:10.1177/0271121416653386
U.S Department of Education Office for Civil Rights (2016). Data Snapshot: Early Childhood Education. Retrieved from https:// www2.ed.gov/about/offices/list/ocr/docs/crdc-early-learning-snapshot.pdf.
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