1. ACF. (2010). Head Start impact study: Final report. Office of Planning Research and Evaluation. https://www.acf.hhs.gov/opre/resource/head-start-impact-study-final-report-executive-summary
2. ACF. (2012). Third grade follow-up to the Head Start impact study: Final report. Office of Planning Research and Evaluation. https://www.acf.hhs.gov/opre/resource/third-grade-follow-up-to-the-head-start-impact-study-final-report
3. ACF. (2017a). Head Start family and Child Experiences Survey (FACES), 1997-2018. Office of Planning, Research & Evaluation. https://www.acf.hhs.gov/opre/research/project/head-start-family-and-child-experiences-survey-faces
4. ACF. (2017b). History of Head Start. Office of Head Start. https://www.acf.hhs.gov/ohs/about/history-of-head-start
5. ACF. (2021). Head Start federal funding and funded enrollment history. https://eclkc.ohs.acf.hhs.gov/sites/default/files/pdf/head-start-federal-funding-funded-enrollment-history-eng.pdf