- Karoly LA. Early Childhood Interventions: Proven Results, Future Promise. RAND Corporation, 2005.
- Lesnick, Joy, et al. "Reading on grade level in third grade: How is it related to high school performance and college enrollment." Chicago: Chapin Hall at the University of Chicago (2010).
- McKey, Ruth Hubbell. "The Impact of Head Start on Children, Families and Communities. Final Report of the Head Start Evaluation, Synthesis and Utilization Project." (1985).
- Schweinhart L, Montie J, 2004. The High/Scope Perry Preschool Study to Age 40. High/Scope Educational Research Foundation. High/Scope Educational Research Foundation. Accessed on December 21, 2012: http://www.highscope.org/Content.asp?ContentId=219.