1. Administration for Children and Families 2012a History of Head Start http://transition.acf.hhs.gov/programs/ohs/about/history-of-head-start
2. Administration for Children and Families 2012b Justification of estimates for appropriations committees http://www.acf.hhs.gov/sites/default/files/olab/2012_all.pdf
3. Caregivers in day care centers: Does training matter?;Arnett;Journal of Applied Developmental Psychology,1989